Asked by parry

Abc is a triangle where ad bisects angle a and d is the midpoint of bc prove that triangle is isosceles
Answered by Steve
In triangles adb and adc,
angle adb = angle adc
bd = dc
ad = ad
So, the triangles are congruent, meaning
ab = ac so abc is isosceles.
Answered by Anynomous
I've seen this mistakes in a lot of pages. But you should know S.S.A. axiom doesn't prove triangles are congurent..
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