Pentagon Perimeter

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Pentagon Perimeter Calculation:

  •  a =

    Length of a single side

  •  P =

    Perimeter of the pentagon

  •

    Choose the number of decimals to show in your answer. This is also known as significant figures. Select an appropriate amount of significant figures based on the precision of the input numbers.

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Pentagon Perimeter Formula

Given the side length of a pentagon the total perimeter will be five times the side length.

p = 5 * a

Pentagon Perimeter Formula
Finding the Perimeter of a Pentagon

Pentagon Perimeter Variables

A pentagon is a two-dimensional shape with five even sides. The length of one side is required to find the perimeter.

Side (a)
Length of one side of the pentagon.
Perimeter (p)
Total perimeter of the pentagon.

Pentagon Perimeter Solution

What is the perimeter of a pentagon given a side length of 8?

  • p = 5 * a
  • Substitute in the known values
  • p = 5 * a
  • Find the perimeter given a side length (a) of 8
  • p = 40
  • Multiply the side length by the total number of sides, five for a pentagon
  • 40

A pentagon with a side of 8 units will have a perimeter of 40 units.

Pentagon Perimeter Example

If a pentagon has a side of 20 cm what is the perimeter?

  • p = 5 * a
  • p = 5 * 20
  • p = 100
  • 100

A pentagon with a side length of 20 cm has a perimeter of 100 cm, which we can also say is 1 m using the centimeters to meters converter.

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Pentagon Perimeter Formula