Q: What is the radius if 9 is the circumference?

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Doubling the radius doubles the circumference.

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

Circumference=2Ï€radius (Ï€ is pi) so... C=2*Ï€*9=18Ï€â‰ˆ56.549

9. Circumference equals 2 times Pi times the radius. C=2(pi)r. "r" for radius. So if your circumference is 18 times pi, then you do 18 divided by 2, which gives you a radius of 9.

r2*pie=circumference 9(9)*pie 81*pie 254

Related questions

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

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

The radius is 1.43

circumference = 2*pi*9

Doubling the radius doubles the circumference.

9 Pi is the circumference.

The radius is about 1.432 units.

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

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

The circumference is about 56.55 yards.

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

56.549