In a circle with center 0, RS is arc of the circle and RS=132 degrees. How many degrees are there in angle RSO?

In a circle with center 0, RS is arc of the circle and RS=132 degrees. How many degrees are there in angle RSO? Correct Answer 24

∠ROS = 132 degrees. Now, since RO = SO = radius then triangle RSO is isosceles, so ∠SRO = ∠RS0 = (180 - 132)/2 = 24. 
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