Question

I need to know how to analysis this

Answer 1

This triangle is separated into two right triangles
if AB=BD(given) so the hypotenuses are congruent

one of the sides is same between the right triangles (BC)

so according to HL theorem, if the hypotenuses and one of the sides (except hypotenuse) between two or more right triangles are congruent to each other
the triangles are congruent


hope you understand it
good luck