To find area of a circle using diameter, you use this formuler. Area=pi(diameter/2)(diameter/2)
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Pi times the radius of the circle squared = area And diameter is simply the radius x 2, since the radius is half the length of the circle.
The diameter of a circle with an area of 37.68 is 6.92
Its just the area of a circle 21 inches or 21 centimeters? area of a circle is (pi)*r2 where pi = 3.1415.... and r = radius thus A = (3.1415)*(diameter/2)2 u can figure out the answer from that with a calculator
A circle with a diameter has an area of 50.265486543928724876568901 sq. ft.
The area of circle that has diameter of 14 centimeters is: 153.9 cm2