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Perimeter of a polygon is the sum of the measurements of its sides.
Rectangle Perimeter
The perimeter of a rectangle is calculated as follows:
| B - base or length H - height or width Perimeter = 2b + 2h = 2 (b + h) |
Perimeter of the regular polygons
 |  |
| Equilateral triangle | Square |
| P = 1 + 1 + 1 P = 3 · l | P = 1 + 1 + 1 + 1 P = 4 · l |
 |  |
| Pentagon | Hexagon |
| P = 1 + 1 + 1 + 1 + 1 P = 5 · l | P = 1 + 1 + 1 + 1 + 1 + 1 P = 6 · l |
l - measurement of regular polygon side
P - perimeter of regular polygon
For an n-sided polygon we have:
P = n · l Next: Length of the circumference
