You know that the formula of area for a circle is = pi * r^2 ... r being the radius.
Therefore, you can plug it in to solve.
pi * r^2 = 108. You need to isolate r, so you would divide by pi for both sides.
r^2 = 34.378 . Then you can square root both sides
r = 5.68 . Of course, I am rounding! So you if you want an exact answer, leave the pi sign!
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The area of a circle with a radius of 14.4 is 651.4
Area of a circle = pi*radius squared
The area of a circle of radius 21 is 1386
A circle with a radius of 135 units has an area of 57,255.53 square units.
If the area of a circle is 40.7 the radius is: about 3.6 (3.599)