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Prove that the area of the triangle formed by the medians is equal to $3/4$ the area of the original triangle


How to find area of triangle from its mediansInequality in triangle involving side lenghs, medians and areaRatio of area of triangle to that formed by its mediansTriangle inscribed inside a circle: prove that $abc = 4 times area times R$Area of a circumcenter triangle equals area of medial triangleA plane contains a set of marked points, such that any three can be covered by a unit disk. Prove that the entire set can be covered by a unit disk.Inequality from IMO 2000 problem 4 question $prodlimits_cycleft(a-1+frac1bright)leq 1$ $abc=1$For all triangle prove that $sumlimits_cycm_acosfracalpha2geqfrac34(a+b+c)$Parallelogram Contest ProblemFinding Value of Expression in a TriangleFinding the area of inner triangle constructed by three cevian lines of a large triangle













1












$begingroup$


This is Question $2$ from this document on Olympiad Geometry.




Let $ABC$ be a triangle and $M_A,M_B,M_C$ the midpoints of the sides $BC, CA, AB$, respectively. Show that the triangle with side lengths $AM_A, BM_B, CM_C$ has area $3/4$ that of the triangle $ABC$.




This is part of a chapter that stresses that by "slicing and dicing", we can solve a lot of complicated problems. Hence, the stress is on diagrammatic proofs.



To form a triangle with the medians, I extended $AM_A$ beyond $BC$, and formed another copy of the triangle $ABC$. My diagram looks like this:
enter image description here



Obviously $BP=CM_C$. Hence, if $PM_B=AM_A$, we'll have created a triangle with the medians as sides.




So my question is, is $AM_A=PM_B$? A followup question would be is it easy to see that the area of the triangle $BPM_B$ is equal to $3/8$ that of the parallelogram given?











share|cite|improve this question









$endgroup$











  • $begingroup$
    Hint: Yes, $AM_A = PM_B$. Look at triangles $triangle CPM_B$ and $triangle CA'A$. They are similar.
    $endgroup$
    – Sameer Kailasa
    2 days ago










  • $begingroup$
    @SameerKailasa- Haha yes should've seen that. How about proving that the area of $BPM_B$ is equal to $3/8$ the area of $ABCA'$? Is it easy to see from this diagram?
    $endgroup$
    – Anju George
    2 days ago










  • $begingroup$
    You will find very inspiring the answers of math.stackexchange.com/q/396085
    $endgroup$
    – Jean Marie
    2 days ago






  • 1




    $begingroup$
    Besides, use for example geogebra to draw your figures instead of a photograph of an approximate figure drawn on a blackboard :)
    $endgroup$
    – Jean Marie
    2 days ago










  • $begingroup$
    See as well jwilson.coe.uga.edu/emt725/Medians.Triangle/…
    $endgroup$
    – Jean Marie
    yesterday















1












$begingroup$


This is Question $2$ from this document on Olympiad Geometry.




Let $ABC$ be a triangle and $M_A,M_B,M_C$ the midpoints of the sides $BC, CA, AB$, respectively. Show that the triangle with side lengths $AM_A, BM_B, CM_C$ has area $3/4$ that of the triangle $ABC$.




This is part of a chapter that stresses that by "slicing and dicing", we can solve a lot of complicated problems. Hence, the stress is on diagrammatic proofs.



To form a triangle with the medians, I extended $AM_A$ beyond $BC$, and formed another copy of the triangle $ABC$. My diagram looks like this:
enter image description here



Obviously $BP=CM_C$. Hence, if $PM_B=AM_A$, we'll have created a triangle with the medians as sides.




So my question is, is $AM_A=PM_B$? A followup question would be is it easy to see that the area of the triangle $BPM_B$ is equal to $3/8$ that of the parallelogram given?











share|cite|improve this question









$endgroup$











  • $begingroup$
    Hint: Yes, $AM_A = PM_B$. Look at triangles $triangle CPM_B$ and $triangle CA'A$. They are similar.
    $endgroup$
    – Sameer Kailasa
    2 days ago










  • $begingroup$
    @SameerKailasa- Haha yes should've seen that. How about proving that the area of $BPM_B$ is equal to $3/8$ the area of $ABCA'$? Is it easy to see from this diagram?
    $endgroup$
    – Anju George
    2 days ago










  • $begingroup$
    You will find very inspiring the answers of math.stackexchange.com/q/396085
    $endgroup$
    – Jean Marie
    2 days ago






  • 1




    $begingroup$
    Besides, use for example geogebra to draw your figures instead of a photograph of an approximate figure drawn on a blackboard :)
    $endgroup$
    – Jean Marie
    2 days ago










  • $begingroup$
    See as well jwilson.coe.uga.edu/emt725/Medians.Triangle/…
    $endgroup$
    – Jean Marie
    yesterday













1












1








1





$begingroup$


This is Question $2$ from this document on Olympiad Geometry.




Let $ABC$ be a triangle and $M_A,M_B,M_C$ the midpoints of the sides $BC, CA, AB$, respectively. Show that the triangle with side lengths $AM_A, BM_B, CM_C$ has area $3/4$ that of the triangle $ABC$.




This is part of a chapter that stresses that by "slicing and dicing", we can solve a lot of complicated problems. Hence, the stress is on diagrammatic proofs.



To form a triangle with the medians, I extended $AM_A$ beyond $BC$, and formed another copy of the triangle $ABC$. My diagram looks like this:
enter image description here



Obviously $BP=CM_C$. Hence, if $PM_B=AM_A$, we'll have created a triangle with the medians as sides.




So my question is, is $AM_A=PM_B$? A followup question would be is it easy to see that the area of the triangle $BPM_B$ is equal to $3/8$ that of the parallelogram given?











share|cite|improve this question









$endgroup$




This is Question $2$ from this document on Olympiad Geometry.




Let $ABC$ be a triangle and $M_A,M_B,M_C$ the midpoints of the sides $BC, CA, AB$, respectively. Show that the triangle with side lengths $AM_A, BM_B, CM_C$ has area $3/4$ that of the triangle $ABC$.




This is part of a chapter that stresses that by "slicing and dicing", we can solve a lot of complicated problems. Hence, the stress is on diagrammatic proofs.



To form a triangle with the medians, I extended $AM_A$ beyond $BC$, and formed another copy of the triangle $ABC$. My diagram looks like this:
enter image description here



Obviously $BP=CM_C$. Hence, if $PM_B=AM_A$, we'll have created a triangle with the medians as sides.




So my question is, is $AM_A=PM_B$? A followup question would be is it easy to see that the area of the triangle $BPM_B$ is equal to $3/8$ that of the parallelogram given?








contest-math






share|cite|improve this question













share|cite|improve this question











share|cite|improve this question




share|cite|improve this question










asked 2 days ago









Anju GeorgeAnju George

564




564











  • $begingroup$
    Hint: Yes, $AM_A = PM_B$. Look at triangles $triangle CPM_B$ and $triangle CA'A$. They are similar.
    $endgroup$
    – Sameer Kailasa
    2 days ago










  • $begingroup$
    @SameerKailasa- Haha yes should've seen that. How about proving that the area of $BPM_B$ is equal to $3/8$ the area of $ABCA'$? Is it easy to see from this diagram?
    $endgroup$
    – Anju George
    2 days ago










  • $begingroup$
    You will find very inspiring the answers of math.stackexchange.com/q/396085
    $endgroup$
    – Jean Marie
    2 days ago






  • 1




    $begingroup$
    Besides, use for example geogebra to draw your figures instead of a photograph of an approximate figure drawn on a blackboard :)
    $endgroup$
    – Jean Marie
    2 days ago










  • $begingroup$
    See as well jwilson.coe.uga.edu/emt725/Medians.Triangle/…
    $endgroup$
    – Jean Marie
    yesterday
















  • $begingroup$
    Hint: Yes, $AM_A = PM_B$. Look at triangles $triangle CPM_B$ and $triangle CA'A$. They are similar.
    $endgroup$
    – Sameer Kailasa
    2 days ago










  • $begingroup$
    @SameerKailasa- Haha yes should've seen that. How about proving that the area of $BPM_B$ is equal to $3/8$ the area of $ABCA'$? Is it easy to see from this diagram?
    $endgroup$
    – Anju George
    2 days ago










  • $begingroup$
    You will find very inspiring the answers of math.stackexchange.com/q/396085
    $endgroup$
    – Jean Marie
    2 days ago






  • 1




    $begingroup$
    Besides, use for example geogebra to draw your figures instead of a photograph of an approximate figure drawn on a blackboard :)
    $endgroup$
    – Jean Marie
    2 days ago










  • $begingroup$
    See as well jwilson.coe.uga.edu/emt725/Medians.Triangle/…
    $endgroup$
    – Jean Marie
    yesterday















$begingroup$
Hint: Yes, $AM_A = PM_B$. Look at triangles $triangle CPM_B$ and $triangle CA'A$. They are similar.
$endgroup$
– Sameer Kailasa
2 days ago




$begingroup$
Hint: Yes, $AM_A = PM_B$. Look at triangles $triangle CPM_B$ and $triangle CA'A$. They are similar.
$endgroup$
– Sameer Kailasa
2 days ago












$begingroup$
@SameerKailasa- Haha yes should've seen that. How about proving that the area of $BPM_B$ is equal to $3/8$ the area of $ABCA'$? Is it easy to see from this diagram?
$endgroup$
– Anju George
2 days ago




$begingroup$
@SameerKailasa- Haha yes should've seen that. How about proving that the area of $BPM_B$ is equal to $3/8$ the area of $ABCA'$? Is it easy to see from this diagram?
$endgroup$
– Anju George
2 days ago












$begingroup$
You will find very inspiring the answers of math.stackexchange.com/q/396085
$endgroup$
– Jean Marie
2 days ago




$begingroup$
You will find very inspiring the answers of math.stackexchange.com/q/396085
$endgroup$
– Jean Marie
2 days ago




1




1




$begingroup$
Besides, use for example geogebra to draw your figures instead of a photograph of an approximate figure drawn on a blackboard :)
$endgroup$
– Jean Marie
2 days ago




$begingroup$
Besides, use for example geogebra to draw your figures instead of a photograph of an approximate figure drawn on a blackboard :)
$endgroup$
– Jean Marie
2 days ago












$begingroup$
See as well jwilson.coe.uga.edu/emt725/Medians.Triangle/…
$endgroup$
– Jean Marie
yesterday




$begingroup$
See as well jwilson.coe.uga.edu/emt725/Medians.Triangle/…
$endgroup$
– Jean Marie
yesterday










1 Answer
1






active

oldest

votes


















2












$begingroup$

Regarding the question, whether $AM_A=PM_B$, the answer is YES.



Simply observe that $$fracCPCA'=fracCM_BCA$$ Thus, in virtue of the Intercept theorem (also known as "Thales' Theorem") $$fracPM_BAA'=fracCPCA'=frac12$$



Can you end it now?




Alternatively, here you have a proof (almost) without words.
enter image description here



Definition: $[...]$ denotes the area of the polygon "..."



Observe that $CE$ is a median in $Delta CDH$. Thus




$$1=fracDKKHfrac[DKE][EKH]=frac[DKC][KHC]=frac[DKC]-[DKE][KHC]-[EKH]=frac[DEC][EHC]iff [DEC]=[EHC]$$ Similarly $$[DEC]=[DHE]=[EHC]$$




Futhermore $$[DEC]=frac[ABC]4$$ Can you end it now?






share|cite|improve this answer











$endgroup$








  • 1




    $begingroup$
    Nice presentation. A little remark : "Intercept theorem" has another very common name in many countries which is "Thales theorem"
    $endgroup$
    – Jean Marie
    yesterday






  • 1




    $begingroup$
    In Spain we also know it as "Thales Theorem", but when I looked it up in the English Wikipedia, I fount "intercepting theorem"...- Edited!
    $endgroup$
    – Dr. Mathva
    yesterday







  • 2




    $begingroup$
    Thanks for the manes of this mathematician !
    $endgroup$
    – Jean Marie
    yesterday










  • $begingroup$
    +1 @Dr.Mathva ...
    $endgroup$
    – Maria Mazur
    yesterday










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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









2












$begingroup$

Regarding the question, whether $AM_A=PM_B$, the answer is YES.



Simply observe that $$fracCPCA'=fracCM_BCA$$ Thus, in virtue of the Intercept theorem (also known as "Thales' Theorem") $$fracPM_BAA'=fracCPCA'=frac12$$



Can you end it now?




Alternatively, here you have a proof (almost) without words.
enter image description here



Definition: $[...]$ denotes the area of the polygon "..."



Observe that $CE$ is a median in $Delta CDH$. Thus




$$1=fracDKKHfrac[DKE][EKH]=frac[DKC][KHC]=frac[DKC]-[DKE][KHC]-[EKH]=frac[DEC][EHC]iff [DEC]=[EHC]$$ Similarly $$[DEC]=[DHE]=[EHC]$$




Futhermore $$[DEC]=frac[ABC]4$$ Can you end it now?






share|cite|improve this answer











$endgroup$








  • 1




    $begingroup$
    Nice presentation. A little remark : "Intercept theorem" has another very common name in many countries which is "Thales theorem"
    $endgroup$
    – Jean Marie
    yesterday






  • 1




    $begingroup$
    In Spain we also know it as "Thales Theorem", but when I looked it up in the English Wikipedia, I fount "intercepting theorem"...- Edited!
    $endgroup$
    – Dr. Mathva
    yesterday







  • 2




    $begingroup$
    Thanks for the manes of this mathematician !
    $endgroup$
    – Jean Marie
    yesterday










  • $begingroup$
    +1 @Dr.Mathva ...
    $endgroup$
    – Maria Mazur
    yesterday















2












$begingroup$

Regarding the question, whether $AM_A=PM_B$, the answer is YES.



Simply observe that $$fracCPCA'=fracCM_BCA$$ Thus, in virtue of the Intercept theorem (also known as "Thales' Theorem") $$fracPM_BAA'=fracCPCA'=frac12$$



Can you end it now?




Alternatively, here you have a proof (almost) without words.
enter image description here



Definition: $[...]$ denotes the area of the polygon "..."



Observe that $CE$ is a median in $Delta CDH$. Thus




$$1=fracDKKHfrac[DKE][EKH]=frac[DKC][KHC]=frac[DKC]-[DKE][KHC]-[EKH]=frac[DEC][EHC]iff [DEC]=[EHC]$$ Similarly $$[DEC]=[DHE]=[EHC]$$




Futhermore $$[DEC]=frac[ABC]4$$ Can you end it now?






share|cite|improve this answer











$endgroup$








  • 1




    $begingroup$
    Nice presentation. A little remark : "Intercept theorem" has another very common name in many countries which is "Thales theorem"
    $endgroup$
    – Jean Marie
    yesterday






  • 1




    $begingroup$
    In Spain we also know it as "Thales Theorem", but when I looked it up in the English Wikipedia, I fount "intercepting theorem"...- Edited!
    $endgroup$
    – Dr. Mathva
    yesterday







  • 2




    $begingroup$
    Thanks for the manes of this mathematician !
    $endgroup$
    – Jean Marie
    yesterday










  • $begingroup$
    +1 @Dr.Mathva ...
    $endgroup$
    – Maria Mazur
    yesterday













2












2








2





$begingroup$

Regarding the question, whether $AM_A=PM_B$, the answer is YES.



Simply observe that $$fracCPCA'=fracCM_BCA$$ Thus, in virtue of the Intercept theorem (also known as "Thales' Theorem") $$fracPM_BAA'=fracCPCA'=frac12$$



Can you end it now?




Alternatively, here you have a proof (almost) without words.
enter image description here



Definition: $[...]$ denotes the area of the polygon "..."



Observe that $CE$ is a median in $Delta CDH$. Thus




$$1=fracDKKHfrac[DKE][EKH]=frac[DKC][KHC]=frac[DKC]-[DKE][KHC]-[EKH]=frac[DEC][EHC]iff [DEC]=[EHC]$$ Similarly $$[DEC]=[DHE]=[EHC]$$




Futhermore $$[DEC]=frac[ABC]4$$ Can you end it now?






share|cite|improve this answer











$endgroup$



Regarding the question, whether $AM_A=PM_B$, the answer is YES.



Simply observe that $$fracCPCA'=fracCM_BCA$$ Thus, in virtue of the Intercept theorem (also known as "Thales' Theorem") $$fracPM_BAA'=fracCPCA'=frac12$$



Can you end it now?




Alternatively, here you have a proof (almost) without words.
enter image description here



Definition: $[...]$ denotes the area of the polygon "..."



Observe that $CE$ is a median in $Delta CDH$. Thus




$$1=fracDKKHfrac[DKE][EKH]=frac[DKC][KHC]=frac[DKC]-[DKE][KHC]-[EKH]=frac[DEC][EHC]iff [DEC]=[EHC]$$ Similarly $$[DEC]=[DHE]=[EHC]$$




Futhermore $$[DEC]=frac[ABC]4$$ Can you end it now?







share|cite|improve this answer














share|cite|improve this answer



share|cite|improve this answer








edited yesterday

























answered yesterday









Dr. MathvaDr. Mathva

2,296526




2,296526







  • 1




    $begingroup$
    Nice presentation. A little remark : "Intercept theorem" has another very common name in many countries which is "Thales theorem"
    $endgroup$
    – Jean Marie
    yesterday






  • 1




    $begingroup$
    In Spain we also know it as "Thales Theorem", but when I looked it up in the English Wikipedia, I fount "intercepting theorem"...- Edited!
    $endgroup$
    – Dr. Mathva
    yesterday







  • 2




    $begingroup$
    Thanks for the manes of this mathematician !
    $endgroup$
    – Jean Marie
    yesterday










  • $begingroup$
    +1 @Dr.Mathva ...
    $endgroup$
    – Maria Mazur
    yesterday












  • 1




    $begingroup$
    Nice presentation. A little remark : "Intercept theorem" has another very common name in many countries which is "Thales theorem"
    $endgroup$
    – Jean Marie
    yesterday






  • 1




    $begingroup$
    In Spain we also know it as "Thales Theorem", but when I looked it up in the English Wikipedia, I fount "intercepting theorem"...- Edited!
    $endgroup$
    – Dr. Mathva
    yesterday







  • 2




    $begingroup$
    Thanks for the manes of this mathematician !
    $endgroup$
    – Jean Marie
    yesterday










  • $begingroup$
    +1 @Dr.Mathva ...
    $endgroup$
    – Maria Mazur
    yesterday







1




1




$begingroup$
Nice presentation. A little remark : "Intercept theorem" has another very common name in many countries which is "Thales theorem"
$endgroup$
– Jean Marie
yesterday




$begingroup$
Nice presentation. A little remark : "Intercept theorem" has another very common name in many countries which is "Thales theorem"
$endgroup$
– Jean Marie
yesterday




1




1




$begingroup$
In Spain we also know it as "Thales Theorem", but when I looked it up in the English Wikipedia, I fount "intercepting theorem"...- Edited!
$endgroup$
– Dr. Mathva
yesterday





$begingroup$
In Spain we also know it as "Thales Theorem", but when I looked it up in the English Wikipedia, I fount "intercepting theorem"...- Edited!
$endgroup$
– Dr. Mathva
yesterday





2




2




$begingroup$
Thanks for the manes of this mathematician !
$endgroup$
– Jean Marie
yesterday




$begingroup$
Thanks for the manes of this mathematician !
$endgroup$
– Jean Marie
yesterday












$begingroup$
+1 @Dr.Mathva ...
$endgroup$
– Maria Mazur
yesterday




$begingroup$
+1 @Dr.Mathva ...
$endgroup$
– Maria Mazur
yesterday

















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Lowndes Grove History Architecture References Navigation menu32°48′6″N 79°57′58″W / 32.80167°N 79.96611°W / 32.80167; -79.9661132°48′6″N 79°57′58″W / 32.80167°N 79.96611°W / 32.80167; -79.9661178002500"National Register Information System"Historic houses of South Carolina"Lowndes Grove""+32° 48' 6.00", −79° 57' 58.00""Lowndes Grove, Charleston County (260 St. Margaret St., Charleston)""Lowndes Grove"The Charleston ExpositionIt Happened in South Carolina"Lowndes Grove (House), Saint Margaret Street & Sixth Avenue, Charleston, Charleston County, SC(Photographs)"Plantations of the Carolina Low Countrye