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Multiply the diameter by 3.1415

NO - ignore that! Diameter x pi (3.1416) is the circumference, the distance around a circle.

Square footage is area, so the correct formula is Area = 3.1416 times radius squared. The radius would be measured in feet.

Q: How do you compute the square footage inside a circle?

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you have to treat it like a square then subtract the missing areas

Pxr2

If you mean a circle then its square footage formula is: pi*radius2

The square footage of a radius is meaningless, but if you mean the square footage of a circle of radius say R, the answer is 3.142 x R x R

490.87

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you have to treat it like a square then subtract the missing areas

Pxr2

The square footage of a circle that measures 159 feet in circumference is about 2,012 square feet.

Area of a circle = pi*radius2

If you mean a circle then its square footage formula is: pi*radius2

The square footage of a radius is meaningless, but if you mean the square footage of a circle of radius say R, the answer is 3.142 x R x R

10,354.9 square feet.

7850

490.87

Area of a circle = pi*radius2 measured in square feet

Area of a circle = pi*radius2

Area of a circle = pi*radius2