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Circumference = 2 x π x radius

⇒ radius = circumference ÷ (2 x π)

So divide the circumference by 2 x π ~= 2 x 3.14 = 6.28

⇒ radius = 22 inches ÷ 6.28 ~= 3.5 inches.

As an approximation to π (the ratio between a circle's circumference and its diameter), the value 22/7 is sometimes used (to 2 decimal places 22/7 = 3.14 & π = 3.14). The circumference given as 22 inches suggests this approximation should be used:

22 ÷ (2 x 22/7) = 22 x 7/22 ÷ 2 = 7 ÷ 2 = 3.5

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14y ago

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