For a rectangle: length times width
For a triangle: length times width divided by two
For a circle: pie times radius squared
For a rectangular prisim: length times width times height
For a sphere: four thirds pie times radius cubed
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A=lw or a different formula depending on the object
Square feet measure area. The formula will depend on what you want to know the area of.
The formula for the area of the square is length multiplied by width.
To calculate the area of a circle use this formula: pi x r2.
Base x Height