Question

what is the equation for finding the answer?​

Answer 1

<AQB = 130°

Here, APBQ is a cyclic Quadrilateral...

So, <AQB + <APB = 180°

130° + < APB = 180°

<APB = 180°- 130°

<APB =50°

.........

now , from the theorem.. the angle subtend by an acr is double at the center from any other point of circle.

So, <AOB = 50°×2 = 100°

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