pi x 10² = 100 pi = 314.159265... square inches
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pi*10*10 square inches
Area = pi*102 = 314.159 square inches to 3 dp
If a circle has a diameter of 10 inches across it then its radius is half of 10 inches which is 5 inches.
A circle with a radius of 10 inches has a circumference of 62.8 inches.
A circle with a radius of 10 metres has an area of 314.16 square metres.