Question

In triangle ABC, X, Y ,Z are the mid points of BC , CA and AB respectively. Prove that ∆AYZ , ∆BXZ , ∆CXY and ∆XYZ are congruent ∆s.

Answer 1

it is simple congruent all the triangles by SAS

Answer 2

Sorry for the mess.
Replace d e f with x y z.