LxW multiply length by width. For triangle divide by two. Most irregular shapes can be broken down into triangle and rectangles. Add the pieces
This question is impossible to answer, since the shape that you are calculating the area of is not mentioned.
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Square feet measure area. The formula will depend on what you want to know the area of.
rectangle
width x length divided by 144 will give you square ft.
length x width = area (sq. foot)
If you mean a circle then its square footage formula is: pi*radius2