Why do the 3 medians of a triangle create 6 similar triangles with equal area?

  • Context: High School 
  • Thread starter Thread starter Perplexing
  • Start date Start date
  • Tags Tags
    Proof Triangle
Click For Summary

Discussion Overview

The discussion revolves around the geometric property of triangles, specifically how the three medians of a triangle create six similar triangles with equal area. Participants are seeking a proof for this property using simple geometric principles.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant asserts that the three medians of a triangle split it into six similar triangles with equal area and requests a proof.
  • Another participant questions the basis of this claim, asking if it was learned from someone else or invented, emphasizing the importance of proof in mathematics.
  • A participant provides a geometric argument involving points on the sides of the triangle and the intersection of the medians, suggesting that areas of certain triangles are equal based on their construction.
  • There is a suggestion that proving the median of a triangle divides the area into two equal portions is central to the discussion.
  • One participant notes that the base and height of two triangles formed by the median are equal, implying equal area.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the proof of the property. There are competing views regarding the understanding and validity of the claim about the medians and the areas of the triangles they create.

Contextual Notes

Some statements rely on assumptions about the properties of medians and areas that are not fully explored or proven within the discussion.

Perplexing
Messages
3
Reaction score
0
I know that the 3 medians of a triangle split the triangle into 6 similair triangles with equal area.

I wish to know the proof for this using simple geometry.
 
Mathematics news on Phys.org
How do you know that??Did someone tell u,or you just invented it??

Daniel.

PS.If someone did tell u,why didn't u ask for the proof??Did u buy it,just like that??In mathematics,things don't work that way...
 
let's say...
you have a triangle ABC...
D is the point in between A and B
E is the point in between B and C
F is the point in between C and A
and O is the point 3 median lines intersect each other...

AD=DB,AF=FC,BE=EC by definition
area ADO=area BDO, area AFO=CFO, area BEO = CEO
area ABE=ACE

area ABO=ABE-BEO
area ACO=ACE-CEO
this implies ABO=ACO
since ADO=DBO, ADO=1/2ABO
since AFO=FCO, AFO= 1/2AFO=1/2ABO=ADO,
so, AFO=FCO=ABO=ADO
use the same method, you can show AFP=FCO=ABO=ADO=BEO=CEO
 
So i think everything comes down to proving that the median of a side of a triangle divides the area enclosed by the triangle into 2 equisuperficial portions...

Can u show that??

BTW,the triangle does not have an area...

Daniel.
 
the base and the height of those two triangles have equal value
 
Well,Vincentchan,i was obviously asking the OP...

Daniel.

PS.I knew you could answer it... :-p
 

Similar threads

  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 13 ·
Replies
13
Views
3K
  • · Replies 9 ·
Replies
9
Views
3K
Replies
1
Views
2K
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 30 ·
2
Replies
30
Views
6K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 17 ·
Replies
17
Views
11K