Area and Perimeter of a Circle  Geometry Calculator

An online calculator to calculate the area A and perimeter P of a circle given its radius r. The formulas for the perimeter P and area A of a circle are given by:
How to use the calculatorEnter the radius r as a positive real number and press "calculate". The outputs are the area and perimeter of the circle.
More References and linksGrade 8 Problems and Questions on Circles with AnswersOnline Geometry Calculators and Solvers 