The formula entirely depends on the shape of the outline being considered.
A few examples include:
-- Circle . . . Area = (pi) (Radius)2
-- Square . . . Area = (length of one side)2
-- Rectangle . . . Area = (length) x (width)
-- Triangle . . . Area = 1/2 (length of the base) x (height)
Other shapes have different formulas.
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If you mean a circle then its square footage formula is: pi*radius2
Treat it as a square and half the result.
One thing that can be calculated using a Square Footage Calculator is the Length and Width of a Rectangle, Circle, Square or Triangle. This comes in handy for calculating room sizes.
length x width = area (sq. foot)