Area = 1/4*Pi*d2 = 0.25*3.14*162(256)= about 200.963ft2
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The area of a circle with a 13 ft diameter is: 132.7 square feet.
Twice as big which will be 16 ft
The area is 56.745 feet2
Area = 415.48 ft2
The 4' x 4' figure has an area of 4' x 4' = 16 square feet. The area of a circle is pi times the square of the radius. If a circle has an area of 16 square feet, then pi x r2 = 16 ft2. We'll take the 16, divide it by pi and the answer will be the square of the radius. And 16/pi = about 5.093 square feet and the square root of that is about 2.257 feet. The radius of a circle with an area of 16 ft2 is about 2.257 feet. The diameter of a circle is twice its radius, and in this case, 2.257 feet x 2 will have be the circle with a diameter = 4.514 feet.