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The area of a circle is 81pi mm^2. What’s its circumference?

Solution

The area of a circle is 81\pi mm^{2}. What’s its circumference?

Solution

c i rc u m f ere n ce : 18 π mm

+1

Solution steps

Given:

a re a : 81 π m m^{2}

Radius given

A re a = 81 π : r = 9

Circle circumference given

r = 9 : C = 18 π

c i rc u m f ere n ce : 18 π mm

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