# Perimeter Formulas and

Circumference of a Circle Formula

The perimeter formula is one of the easier formulas to remember in math! The **perimeter**
of a shape is the distance around the outside of the shape. Therefore,
all we need to do is add the measurement of each side of the shape and
we will have the perimeter.

For a circle, we can find the distance around the outside, but it's
not called the perimeter. Instead it is called the circumference.
Because the circle doesn't have straight sides, we will use a special
formula to find the circumference

For any other polygon, if you simply add the dimensions of each side, you can calculate the perimeter.

We can use a few short-cut formulas for the perimeter of a square and rectangle. Take a look at the examples below.

## Perimeter of a Square

The perimeter of a square is very simple to calculate. You could add
all four sides together (ex: 2+2+2+2 = 8). Since all four sides are
the same measurement, it would be easier to multiply the measurement by 4
(ex 4 x 2 = 8).

Perimeter of a Rectangle

For a rectangle, the dimensions of the lengths are the same and the
dimensions of the widths are the same. Therefore, the following formula
can be used for rectangles.

Circumference of a Circle

We do not call the distance around the outside of a circle, the
perimeter. Instead, we call it the circumference. Same meaning,
different terminology! Below you'll find definitions for "circle"
vocabulary and the circumference formula.

You Might Also Like These Other Formula Pages

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