perimeter or circumference = 2*pi*7 m
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Radius of circle: 157/2pi = 25 m rounded
Radius = 22/2pi m
the diameter of a circle with the radius of 9m is 18m
Perimeter of rectangle: 2*(7+6) = 26 m
The formula for an area of a circle is the greek symbol "pi" times the radius squared. A = π * r2 r = radius π = 3.14 Now, your radius is given to you in millimeters. Generally answers are given in meters. 7 mm (millimeters) is equal to .007 m (meters).