Multiply the radius by (2 x pi).
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A circle with a radius of 1 meter has a circumference of 6.28 meters.
circumference = 2 * pi * r ----> pi is a constant in this case circumference = 2 * 3.142 * 10 ------> radius is 1/2 of a diameter So, circumference of this circle is 62.84 inches
Circumference of the circle is: 2 times pi
area of a circle = pi * radius² = 1 radius = √(1/pi) circumference = 2pi * radius = 2pi * √(1/pi) = 3.5449077
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