- Perimeter The perimeter of a polygon is the sum of the lengths of
the sides of that polygon.
- Perimeter formulas:
Equilateral triangle (length of side, s): P = 3s
Rectangle (length of sides, L and W): P = 2L + 2W
Square (length of side, s): P = 4s
- Circumference of a circle (radius, r): C = 2πr
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