To find the diagonal measurement of a 20ft x 30ft building, you can use the Pythagorean theorem. The formula is (d = \sqrt{(length^2 + width^2)}). Plugging in the values, (d = \sqrt{(20^2 + 30^2)} = \sqrt{(400 + 900)} = \sqrt{1300} \approx 36.06) feet. Thus, the diagonal measurement is approximately 36.06 feet.
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All you need to do is multiply the length by the width, and it doesn't matter in what order you do it. 20ft X30ft= 600 square feet.
Assuming the shape is an irregular octagon (since there are 8 lengths given), there is not enough information to answer the question. Polygons with more than three sides are not rigid. They can be flexed so that their shape and area changes without changing their side lengths. As an illustration, think of a square that can be flexed to form a rhombus and that can be made as thin as you like, with an area approaching zero.
If you are truly looking for SQUARE FEET for a building with these measurements, more informaiton will be needed. A building, whether square or rectangular, will have only two different measurements. My guess is that you are looking for cubic feet, which would include the height of the building. For Example: 30ft x 20ft x 50ft would be 30 ft wide, 20 foot deep (long), and 50 ft tall. Regardless of the placement and the symbolism of the measurements, the result is the same: 30 x 20 x 50 = 30,000 cubic ft.
30ft*20ft = 600 sq ft
There are 7.48 gallons in 1 cubic foot.Volume of tank = 100ft x 30ft x 20ft = 60000 ft3.60000ft3 x 7.48gal/ft3 = 448800gal