No, you add up all the sides. Yes, in terms of a circle. To determine the perimeter or circumference of a circle, you must multiply: 2πr or two times Pi times the radius of the circle.
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Multiply for the area, add for the perimeter.
Perimeter is most often found by adding.
The perimeter is the length of the outside. If you know the length of one side, multiply that times four to get the perimeter.
to find the perimeter you must add all sides. and to find area you have to multiply lenght and width
Find the length of any of the sides and multiply it by four.