576 pi
My math is as follows: The formula for calculating circumference is pi x diameter (or pi x 2 x radius). If the radius is 24, then the diameter would be 48. Generally pi is equal to 3.14 so the diameter (48) x 3.14 equals a diameter of 150.72.
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The first answer is wrong - it gives the area! The second is approximately correct. Generally pi is NOT equal to 3.14: that is a commonly used approximation. A more accurate answer is 150.80 units.
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Circumference = 2*pi*radius = 150.80 units.
Circumference of the circle if the radius is 12 inches is 2*pi*r = 24*pi = 75.398
A circle with a radius of 24 inches has a circumference of 150.8 inches.
If the diameter of the circle is 24 feet, the radius is half that, or 12 feet. If the circumference of the circle is 24 feet, the radius is 24 divided by 2 divided by pi, or 3.82 feet.
If a circle circumference is 30 the radius is: 4.77