A circle of radius r has an area of Pi*r*r, where Pi is the constant which is approximately 3.14159.
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The formula for area of a circle is: A = pi * r2 (area equals pi times radius squared) There fore if you plug in the numbers you know (pi = 3.14) you get 125 = 3.14 * r2 39.8 = r2 r = 6.31 inches
The area of a circle of radius 21 is 1386
The area of a circle with a radius of 14.4 is 651.4
Area of a circle = pi*radius squared
A circle with a radius of 135 units has an area of 57,255.53 square units.