http://www.1-formula.com/mathematical-formulas/circumference-formula.html Circumference of Circle lesson, you will know how to use Circumference formula to calculate circles perimeter. en-us Tue, 16 Dec 2008 19:05:36 GMT Tue, 6 Jan 2009 19:09:22 GMT www.1-formula.com www.1-formula.com http://www.1-formula.com/mathematical-formulas/circumference-formula/formula-circumference.html Circumference of Circle lesson, you will know how to use Circumference formula to calculate circles perimeter with its radius or diameter. Tue, 6 Jan 2009 19:09:22 GMT http://www.1-formula.com/mathematical-formulas/circumference-formula/formula-circumference.html