There are various formulas depending on the shape of the thing you want to find the area of. Length times width will work for regular rectangles.
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-- Find out the population of the area. -- Find out the area of the area. -- Divide the population by the area. The result is the population density of the area.
The formula to find the area of an octagonal pyramid is area of base plus area of sides.
To find the area of 3ft by 1ft, you multiply the two. So the area is 3 square feet.
It depends on the surface area of what!
To find the area, first divide the shape into regular, simple shapes. Then use formulas to find the area of the smaller, regular shapes. Lastly, add up all the smaller areas to find the area of the original shape.