If it's a circle, then the formula is ╥d (Pi (3.14) times the diameter)
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Add together the lengths of each side of the plane shape.
The linear distance around the outside (the perimeter) of the shape. Find by adding all side lengths. Example: Perimeter of a rectangle: 2B + 2H
circle
If the shape is labeled on each side just add them together, but if it is not, measure the sides then add them together.
if the shape is not labled on all the sides, then you measure each side and add the numbers together. if it is labled, then you just add the numbers on each side