The perimeter or circumference is the distance around a circle whereas the diameter is the distance across a circle through its centre.
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yes, it is correct perimeter = d * pi pi is the ratio between the perimeter and the diameter
The perimeter or circumference of a circle = diameter times pi
The perimeter is the diameter times pi. So the perimeter is 20pi ft
a radius is half the diameter of a circle
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