The top of a manhole cover is shaped like a circle. The area of the manhole cover is 380 square inches. What is the circumferenc
e of the manhole cover, to the nearest inch?
1 answer:
need to find the radius first
area = pi*r^2
380 = PI *r^2
380/PI = r^2
r^2 = 121
r = sqrt(121) = 11 inches
radius is 11 inches
now calculate circumference:
c = 2*PI*r
C = 2 * 3.14 * 11
circumference = 69.08 = 69 inches
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