# Perimeter

In geometry, perimeter is the distance around a flat object. For example, all four sides of a square rhombus have the same length, so a rhombus with side length 2 inches would have a perimeter of 8 inches (2+2+2+2=8).

For a polygon, the perimeter is simply the sum of the length of all of its sides.[1] For a rectangle, the perimeter is twice the sum of its length and width (${\displaystyle P=2\ell +2w}$).[2] Perimeter can also be calculated for other planar figures, such as circle, sector and ellipse.[3]

Real-life objects have perimeters as well. A football field, including the end zones, is 360 feet long and 160 feet wide. This means that the perimeter of the field is 360+160+360+160=1040 feet.

The perimeter of a circle is usually called the circumference.[3] It may be calculated by multiplying the diameter times "Pi". Pi is a constant which is approximately equal to 3.14159; however, the places to the right of the decimal are endless. The number of places used depends on the accuracy required for the result.

## References

1. "Perimeter and Area". www.montereyinstitute.org. Retrieved 2020-09-25.
2. "List of Geometry and Trigonometry Symbols". Math Vault. 2020-04-17. Retrieved 2020-09-25.
3. "Perimeter". www.mathsisfun.com. Retrieved 2020-09-25.