Perimeter Calculator
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Perimeter
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Area
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About Perimeter
The perimeter is the total length of the boundary of a two-dimensional shape. It is the sum of all the sides of the shape.
Formulas
Triangle: P = a + b + c
Rectangle: P = 2(l + w)
Circle: P = 2πr
Regular Polygon: P = n × s
Parallelogram: P = 2(a + b)
Trapezoid: P = a + b + c + d
Where:
- a, b, c, d are side lengths
- l, w are length and width
- r is radius
- n is number of sides
- s is side length