SOLUTION: How do you solve: In a circle with center O, arc RS=12 degrees. How many degrees are there in angle RSO?

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Question 749475: How do you solve:
In a circle with center O, arc RS=12 degrees. How many degrees are there in angle RSO?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
In a circle with center O, arc RS=12 degrees. How many degrees are there in angle RSO?
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RS is not a straight line, it's the arc.
The angle between the tangent at point S and the radius SO is 90 degs