Area = pi*r2
Area = pi(5.29 cm)2
= 87.9 cm2
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A circle with a radius of 18 centimeters has an area of 1,017.88 square centimeters.
3850m is the area of the a circle whose radius of 7meaters
Area = pi R2 = 25 pi = 78.54 square centimeters(rounded)
The formula for the area (A) of a circle is A = πr2. If the area is 100π then 100π = πr2 : 100 = r2 : r = √100 = 10. The radius is of length 10 units.
You get square units, if that's what you mean. The same applies to the area of any other figure.For instance, if the radius is in centimeters, the area will be expressed in square centimeters.