An arc is intercepted by a central angle of 3π/4 radians on a circle with a radius of 28 inches.
What is the exact length of the arc? Enter your answer, in terms of π.
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Arc length, S...is given by
S = r (theta in radians)
So
S = 28 (3pi/4) = 28 (3/4)*pi = [ 21 pi ] inches
+78 
