Divide the diameter by 2.
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What is the circumference of a circle 3ft
The radius (not raduis) is 1.25 cm.
the diameter of a circle is from one side of the circle to the other, and the raduis is always half, because the raduis is from the side to the middle, so the answer is 18
A radius (not raduis) of 15 units implies a circumference of 94 units.
Divide the circumference by 2pi