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Math Challenge I-A Geometry

 
 
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Re: Math Challenge I-A Geometry
WangDr. Kevin - 2021年10月7日 Thursday 01:51
 

(I moved this question out from an announcement post to be its own thread.)

Draw an equilateral triangle.  Connect the midpoints of the sides of this equilateral triangle.  Now the big triangle is divided into 4 smaller ones.  Your task for this problem is to prove that these smaller triangles are all equilateral, and they are all congruent to each other.