Radius = 20/2 = 10
Area of circle = pi x radius x radius = 3.1415 x 10 x 10 = 3.1415 x 100 = 314.15 square units
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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.