Question

What can prove that

Answer 1

Reflecting triangle ABC over line m

Explanation:

By reflecting triangle ABC over line m angle A and angle C overlap, proving they are the same angle, which is true because side AB and BC are equal in length.

Answer 2

If we reflect triangle ABC over line m, it will interchange vertices A and C and vertex hold its position. It is because triangle is isosceles and line m is bisector of angle B.

Hence option (B) is correct.