Area = (pi) x (radius)2 = (pi) x (10)2 = 314.16 (rounded)
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If the diameter of a circle 20 cm is tripled the area will increase from 314.2 cm2 to 2,827 cm2
Divide the diameter by 2 to get the radius. Then use the standard formula for the area of a circle (area = pi x radius2).
314 ft2
Area of circle: pi*20^2 = 400*pi square units
(100 pi) square inches is.