Area = Пr2 = 3.14159 x 32 = 28.27
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A circle with a radius of 3 meters has an area of 28.27 square meters.
It's half of the area of the whole circle...
If you mean area of a circle with a radius of 25 cm then it is:- Area = pi*252 = 1963.495 square cm to 3 decimal places
When you try to figure out an area of a circle, you square the radius, then multiply it by pi to get the area of a circle. A radius square is radius x radius, or radius squared.
Area = pi x (radius^2) so 3.14...(3^2) = 28.274333882308139146163790449516 cm²