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If the blue sector of the circle is a semicircle, find the area of the green sector with a given radius of 6 units.

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Updated 8/14/2011 10:07:03 AM

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Anonymous

18.84 units squared

Added 8/14/2011 10:07:03 AM

What is the diameter of a circle with an area of 81 pi in2?

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Updated 10/9/2014 10:57:48 PM

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18 is the diameter of a circle with an area of 81 pi in2 .

Let radius = r

area = pi*r^2 = pi*81

r^2 = 81

r = 9.

Diameter = 2r = 2*9 = 18 .

Let radius = r

area = pi*r^2 = pi*81

r^2 = 81

r = 9.

Diameter = 2r = 2*9 = 18 .

Added 10/9/2014 10:57:48 PM

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