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.
Doubling the radius doubles the circumference.
The radius is 1.43
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 radius is about 1.432 units.
56.549
The area of a circle with a radius of nine centimeters is: 254.5 cm2
The circumference is about 56.55 yards.
If 9 cm is the diameter, I think the circumference should be 9 times pi centimeters, which is approximately 28.274333882308139146163790449516 centimeters for the circumference. *********************************************** The circumference of a circle can be found by multiplying pi ( π = 3.14 ) by the diameter of the circle. Thus: 3.14 x 9 = 28.26cm