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If the area that needs filling is rectangular shape and the bottom of it is a consistent 7 inches you should need about 418.25 cubic feet of fill dirt. I used the formula for finding the volume of a three dimensional rectangle which is height times width times depth. Using 717 as the width times depth which is the formula for the area of a rectangle, but it would instead be called width and length. With the product of the width and depth being 717 you just have to finish the formula by multiplying 717 by the height (the depth of the hole in the ground) 0.5833... resulting in the volume of the hole in the ground which with volume is measured with a cubed unit while area is a square unit. So You would need approximately 418.25 cubic feet of fill dirt. The formula for the volume of a rectangle shaped box is on this website. http://wiki.answers.com/Q/What_is_the_formula_for_calculating_the_volume_of_a_rectangle

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Q: How much fill dirt do you need to fill a 717 square foot area that is 7 inches deep?
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