1. Find the diameter of the full circle. It's understood that you're only working with half of a circle, but that's OK. The diameter is the longest straight line you can draw across
http://www.ehow.com/how_4489560_perimetersemicir...

The perimeter of a full circle is 2*pi*r. Where, pi is the mathematical constant that is the ratio of any circle's circumference to its diameter, approximately equal to 3.14, and
http://wiki.answers.com/Q/What_is_the_perimeter_of...

Divide the circumference by two to get the curved part of your
http://www.chacha.com/question/whattheformulafo...

The perimeter or circumference of a circle is the diameter times pi. The perimeter of a circle is the outside the part that circle. If you are drawing the circle the amount of graphite
http://answers.ask.com/Science/Mathematics/what_is...
