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The formula for the area of a quadrilateral is... BASE*HEIGHT/3
If you only have square feet, you won't be able to find the height, unless you're mistaking height for length. Area in square feet of a quadrilateral is width times length. To find the length, divide the area by the width.
Firstly, all quadrilaterals are four sided. That is a the definition of a quadrilateral - a four sided figure. One way is to find the area of each half (i.e. two triangles) and add them together. The area of a triangle is half the length of the base times the height.
It's not a matter of 'finding' it. Either the quadrilateral is a parallelogram,or else it is not one.If the opposite sides of the quadrilateral are parallel, then it's a parallelogram.
It depends on what kind of quadrilateral is. Still, you can't solve it.