Question

OA=OB and OD=OC. Show that 1.TriangleAOC is congruent to Triangle BOC. 2.AD II BC​

Answer 1

Answer:

In△AOD&△BCO

=>OD=OC (given)

OA=OB(given)

∠AOD=∠COB (vertically opposite)

=>△AOD≅△BOC

∠OAD=∠OBC(angles corresponding to congruent sides)

[∵ AD & BC make equal angles with the same line AB]

HenceAD∣∣BC