The perimeter of a geometric figure is the distance around the edge of the figure. Perimeter is often denoted by P. The perimeter of a circle is called its circumference.
- Square - 4s, where s is the side length
- Rectangle - 2(l+w), where l is the length and w is the width
- Circle - , where r is the radius
- Regular geometric figure with n sides - ns, where s is the length of the side