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. See 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).

formula for perimeter of a square






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.

formula for perimeter of a rectangle






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.

formula for circumference of a circle



Like Us on Facebook


Recommend this on Google


Algebra Class E-course Members

Username:
Password:

Sign Up for Algebra Class E-courses

Click here to renew or retrieve a lost password.

Search This Site

Custom Search

Having Trouble with Your Homework?

algebrator




[ ?]

Subscribe To This Site

XML RSS
Add to Google
Add to My Yahoo!
Add to My MSN
Add to Newsgator
Subscribe with Bloglines


Enjoy This Site?
Then why not use the button below, to add us to your favorite bookmarking service?

| Homepage | Contact Me | Privacy Policy | Disclaimer |Affiliates



Return to top
By Karin Hutchinson Copyright© Algebra-class.com 2009-2013.