3 times
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Ah, what a delightful question! The radius of a circle fits into the circumference of the circle exactly 2 times. Just imagine the radius wrapping around the circle, giving it a warm hug, and then doing it one more time for good measure. It's a beautiful relationship between the radius and the circumference, creating harmony and balance in the circle's lovely shape.
3.14 or pi
A wheel is in the shape of a circle. The formula for the circumference of a circle is 2πr where r is the radius. But, the diameter of a circle is twice the radius so this equation can be written, Circumference = πd where d is the diameter. The Circumference is therefore π times as big as the diameter, π = 3.142 or 22/7 approx.
Given a diameter d, the circumference of a circle is Pi*d. Thus the circumference is Pi times larger than the diameter.
Circumference = 2*pi*radius or pi*diameter Circumference = 36pi inches