# 1. In quadrilateral , and bisects (see Fig.). Show that  . What can you say about and  ?

In the given triangles we are given that:-

(i)

(ii)  Further, it is given that AB bisects angle A.  Thus  BAC   BAD.

(iii) Side AB is common in both the triangles.

Hence by SAS congruence, we can say that  :

By c.p.c.t. (corresponding parts of congruent triangles are equal) we can say that

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