A bike is not a circle, so the question doesn't mean much as it's stated. But we're
pretty sure that you're referring to one of the bike's wheels.
The definition of "diameter" is "double the radius". If double the radius is 24 inches,
then the radius is (24/2) = 12 inches.
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The radius of a circle is one-half of the circle's diameter. So if the radius is 12 inches, the diameter is 24 inches.
24 inches, because the radius is always 1/2 of the diameter.
The formula to calculate the volume of a sphere is V = (4/3)πr^3, where r is the radius. Since the diameter is 24 inches, the radius would be half of that, which is 12 inches. Plugging this value into the formula, we get V = (4/3)π(12)^3. Therefore, the volume of the sphere is approximately 7238.23 cubic inches.
12 inches
24*pi inches