What is the measure of the central angle of a circle with radius 30 centimeters that intercepts an 18π
centimeters arc?
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Circumference = pi * d = pi * 2 * r
Fraction of circumference = 18 pi / (pi*2*r) (is also fraction of 360 degrees)
Fraction of 360 degree circle 360 * 18 pi /(pi*2*r)
=108 degrees
