Question

answer it please both

Answer 1

Answer:

Step-by-step explanation:

Given: Angle BAC =120°

=>angle BAO=120/2=60° (as OA bisects angle BAC)

Also angle OBA=90° (as radius is perpendicular to tangent)

In right triangle BOA,

Cos angle OAB =AB/AO

Cos 60°= AB/AO

1/2=AB/AO

AO=2AB

Hence proved.