# 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 ().^{[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.

## Related pages[change | change source]

## References[change | change source]

- ↑ "Perimeter and Area".
*www.montereyinstitute.org*. Retrieved 2020-09-25. - ↑ "List of Geometry and Trigonometry Symbols".
*Math Vault*. 2020-04-17. Retrieved 2020-09-25.`{{cite web}}`

: CS1 maint: url-status (link) - ↑
^{3.0}^{3.1}"Perimeter".*www.mathsisfun.com*. Retrieved 2020-09-25.