Question

please click photo and answer me

Answer 1

your answer is in the picture

Answer 2

hey...

1. in triangle AOB , OA and OB are radius of circle...so OA = OB.

OA and OB are also sides of triangle AOB that are equal.

OA = OB (radii of circle.)

angle OBA = angle OAB = 50 degree.

2. in triangle AOC

OC = OA ( radii of circle)

angle OCA = angle OAC = 20 degree.

angle OAB + angle OAC = angle BAC
50 + 20 = 70

by angle subtended theorem

angle BOC = 2 × angle BAC
= 2 × 70

= 140.