The perimeter is equal to Pi times the diameter.
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When the shape is a circle, then the perimeter is called"circumference".The circumference IS the perimeter of a circle.
to find the perimeter of a circle you simply do this (pi x D )
The perimeter of a circle has the formula 2πr. Therefore the length of a semi circle is πr. But the perimeter of a semi circle also includes the diameter which is 2r. Therefore the perimeter of a semi circle = πr + 2r = r(π + 2)
If it's a circle, then the formula is ╥d (Pi (3.14) times the diameter)
The formula for the perimeter of a shape depends on the shape. It is the sum of the lengths of all the sides that enclose the shape.