The area of a circle is pi times (radius squared)
Thus if radius is one inch then area is (pi) times (1) times (1) = pi = 3.1416 inches squared
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a circumference is a point in which two lines meet and the area is=pie R
If the radius of a circle becomes 1/2 as long, the area becomes 1/4 as much.
area of a circle = pi * radius² = 1 radius = √(1/pi) circumference = 2pi * radius = 2pi * √(1/pi) = 3.5449077
Area of a circle = (pi) (R2)R = radius of the circle = 1/2 of its diameter
1/3.15159