PA and PB are two tangents from a point P outside a circle with center O. If A and B are points on the circle such that ∠APB = 80°, then ∠OAB is equal to∶

PA and PB are two tangents from a point P outside a circle with center

1.	PA and PB are two tangents from a point P outside a circle with center O. If A and B are points on the circle such that ∠APB = 80°, then ∠OAB is equal to∶
A.	45°
B.	40°
C.	55°
D.	50°
Answer» C. 55°

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PA and PB are two tangents from a point P outside a circle with center O. If A and B are points on the circle such that ∠APB = 80°, then ∠OAB is equal to∶

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