Circumference and Perimeter

The distance around a shape is called perimeter. In other words, perimeter is the distance around the outside of a closed figure

Perimeter is the sum of length of all the sides of a polygon

Perimeter of a rectangle with length l and width w is 2 x (l + w)

Perimeter of a square with side s is 4 x s

Remember to name the unit of length used to measure the shape

Perimeter is the distance around the outside of a closed figure

Perimeter is the sum of all the side lengths of a polygon

Perimeter of a regular polygon of n equal sides with each side s is n x s

Remember to name the unit of length used to measure the shape

The perimeter of a circle has a special name. It is called the circumference

A diameter is a line segment that passes through the center of the circle and has both the end points on the circle

A radius is a line segment with one endpoint at the center of the circle and the other endpoint on the circle

The distance around a circle is called the circumference. The ratio of the circumference to the diameter, c/d, is the same for any circle and is called ∏, read as "pi"

The value of p is approximated to either 3.14 or 22/7

Perimeter is the sum of length of all the sides of a polygon

Perimeter of a rectangle with length l and width w is 2 x (l + w)

Perimeter of a square with side s is 4 x s

Use the formulas and equate the known and unknown lengths

Remember to name the unit of length used to measure the shape