Area = 1/4*Pi*d2 = 0.25*3.14*12 = about 0.785cm2
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Area = 1/4*Pi*d2 = 0.25*3.14*282 = about 615.75cm2
Radius = 1/2 of diameter = 4 cm
The circumference = (pai) x diameter = 3.14 x 1 = 3.14 cm
The diameter of a 10 cm wide circle is 10 cm. The diameter is just how wide it is. The radius is 1/2 X diameter. 1/2 X 10cm = 5 cm.
It is approx 39.31 square cm.