Perimeter, Circumference, and Area
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Perimeter

Perimeter | Perimeter, Circumference, and Area | Scoop.it
Free math lessons and math homework help from basic math to algebra, geometry and beyond. Students, teachers, parents, and everyone can find solutions to their math problems instantly.  

square = 4a

rectangle = 2a + 2b

 triangle = a + b + c   

circle = 2pi r 

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Circumference

Circumference | Perimeter, Circumference, and Area | Scoop.it
Circumference of a circle is presented in this interactive lesson from Math Goodies. Learn circumference at your own pace.

The distance around a circle is called the circumference. The distance across a circle through the center is called the diameter. is the ratio of the circumference of a circle to the diameter. Thus, for any circle, if you divide the circumference by the diameter, you get a value close to . This relationship is expressed in the following formula:

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