Question

What is D is mdpt of line BC called in proofs(the reason.)?

Answer 1

I don't understand the question.

Answer 2

I'm doing two column proofs

Answer 3

http://regentsprep.org/Regents/math/geometry/GP4/PracCongTri.htm
#3

Answer 4

OK. Because AD bisects BC, it must be true that BD = DC. We already know AB = AC. We also know that AD is common to the two triangles. So, all sides are equal for both triangles. Therefore, both are identical.

Answer 5

ok?