Question

How do i solve this? Please help me find the answer.

Answer 1

Explanation:

The tangent lines meet the radii at 90 degrees.

The way the diagram is drawn, the following formula will work

<AOB + <OAC + OBC + 10 = 360

<OAC = 90

<OBC = 90

<AOB + 90 + 90 + 10 = 360

<AOB + 190 = 360

<AOB = 360 - 190

<AOB = 170