Question

please answer the question

Answer 1

Two angles each of 90 degrees are equal
Two vertically opposite angles are equal
and side BC and AD are equal
by ASA triangles are congruent

Answer 2

consider the triangles BOC and DOA ( i cant see the last alphabet sry)

angle b = angle a ( 90 degree)

angle BOC = angle DOA ( vertically opposite angles)

side bc =  side ab ( given in the diagram)

therefore

triangle BOC is congruent to triangle DOA ( ASA congruency.)

therefore ob = oa ( C.P.C.T) congruent parts of a congruent triangle.

bisect = divide into two equal parts

therefore cd bisects ab

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