Asked by John Zhou
If a length of an arc with measure 80 is 15 pi inches long, find the area of the circle.
Answers
Answered by
Steve
80° = 80/360 = 2/9 of a circle
15π = 2/9 * 2πr
r = 15*9/4
a = πr^2
15π = 2/9 * 2πr
r = 15*9/4
a = πr^2
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