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Q: What is the circumference of a circle that the radius is 9 centimeters?

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If radius of a circle is 9 centimeters the circumference would be: 56.55 cm (r x 2 x Pi = circumference).

A circle with a radius of 9 inches has a circumference of 56.55 inches.

If a circle has a circumference of 18pi, the radius is 9.

The radius is 1.43

Doubling the radius doubles the circumference.

The radius is about 1.432 units.

56.549

Circumference = 2Π• radius 2Π•9 = (18×Π)"≈ 56.5"

A circle with a radius of 9 inches has a circumference of 56.55 inches and a diameter of 18 inches.

The area of a circle with a radius of nine centimeters is: 254.5 cm2

The circumference is about 56.55 yards.

r = 1.43239448783 units

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