One application that involves angle measure is arc length. Let's find the length of the arc intercepted by a central angle of measure π/12 radians in a circle of radius 10 cm. We must evaluate the expression (π/12)(10).
A second application is sector area. For example, find the area of the sector of a circle of
radius 3 feet whose central angle measures 0.8 radians. We must evaluate the expression
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12 
10 
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