try http://www.mathopenref.com/trapezoidarea.html gives you the answers and tells you how they got it very helpful!!!
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a trapaziod
-- 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!