Radius of a circle = 1/2 of the diameter.
Area of a circle = (pi) x (radius)2
For the diameter of 16-ft, radius = 8-ft, and area = (pi) (8)2 = 201.062 square feet (rounded)
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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.
The area of any circle is (pi) x (radius)2 .The area of half the circle is just half of that number.
A circle with a radius of 2.5 meters has an area of 19.63 square meters.
A circle with a radius of 5 units has an area of 78.54 square units.
A circle with a radius of 3 meters has an area of 28.27 square meters.