Question

please answer the question guys please

Answer 1

OA=OB,AOD=BOC,OD=OC
BY SAS AXIOM, ∆AOD is congruent to ∆BOC

Answer 2

In ∆AOD and ∆BOC,
OA=OB(given)
OD=OC(given)
<COB=<AOD(vertically opposite angles)
∆AOD congruent to ∆BOC (SAS)