64pi (miles square)
Chat with our AI personalities
The circumference of a circle is twice the radius times PI [2*pi*r] with r = 4 >> about 25
Area = Pi(r)2 - A circle with a radius of 12 centimeters has an area of 452.39 square centimeters.
Radius = 1/2 of diameter = 7/2 = 3.5 inches
Circumference of a circle = pi*diameter or 2*pi*radius
Radius = Diameter/2 so if diameter = 20 Radius = 20/2 = 10