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The circumference of a circle is the radius times 2 times the irrational number "pi", which is approximately 3.14159. "Irrational" means that the number cannot be calculated as a ratio or fraction, and that the sequence of decimal places never repeats.
So, the circumference of a circle of radius 9 is 56.55.
If you had said that the radius of the circle was 9.0, we could reasonably calculate this to another couple of decimal places, but since the original number wasn't specified to 2 digits of precision, it's not reasonable to try to be more precise in the calculation.
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A circle has a circumference of 18 pi so what is the radius of this circle?
If a circle has a circumference of 18pi, the radius is 9.
How is the circumference of a circle with radius 9 cm related to the circumference of a circle with diameter of 9cm?
Doubling the radius doubles the circumference.
What is the circumference of a circle whose diameter is 9 cm?
A circle with a radius of 4.5 cm has a circumference of 28.27 cm
If there is a radius of 9 cm what is the circumference of the circle?
18 pi
If a circle circumference is 30 what is radius?
If a circle circumference is 30 the radius is: 4.77
