Perimeter & Circumference Return to table of contents

Perimeter Definition: The distance around a two-dimensional figure. w w l l Note: (l) represents the Length, or longer side of the rectangle. (w) represents the Width, or shorter side of the rectangle. If no units are given, use "u".

Perimeter (P) of a rectangle is found by solving the following formula: P = 2l + 2w Perimeter (P) of a square is found by doing four (4) times Side (s): P = 4s S Perimeter of a polygon is the sum of the lengths of the sides.

Circumference Definition: The outer boundary of a circle; the "perimeter" of the circle. Diameter Circumference

The circumference (C) of a circle is found by using one of the following formulas: C =  d or C =  2r or C = 2r2r

Diameter (d): Any straight line segment that passes through the center point of the circle, whose endpoints are on the circle. Radius (r): Any line segment from the center point of the circle, to any point on the circle---radius is 1/2 of the Diameter. oi of the circle, to any point on the circle---radius is 1/2 of the Diameter. C =  d or C = 2  r

Pi (  ), a mathematical constant, is the ratio of a circle's circumference to its diameter. Note: C =  d or C = 2  r