The perimeter or circumference of a circle = diameter times pi
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Multiply the diameter by pi.
Its perimeter is half of its circumference plus its diameter
the perimeter is 3 times as long as the diameter Example: if my diameter is 7 inches long my perimeter is 3 times as much so it is 21 inches long
Diameter is "through", not "around". To find the perimeter ("around"), add the length of the six sides.
Pi x Diameter = CircumferencePi = 3.14...