The exact method varies according to the figure. You must somehow calculate
or measure the length of each segment of the outline, and then sum them.
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by subtracting
You don't. Perimeter is a concept associated with plane figures, not solid shapes.
the area and perimeter of the plane figures are square ,rectangle
Perimeter = sum of the lengths of the sides.
Can be any shape It is the edge of something So perimeter of a property can be round or square or irregular