The formula for the answer is consistant. However the units are variable.
In either case the formula for square feet is as follows:
unit "A" in feet X unit "B" in feet = SQ. FT. Therefore, if in the above example both units "A" and "B" are in feet, the result is ("A" X "B") = SQ. FT.
= 16 X 16 = 256 SQ. FT.
However, the units are in inches the correct result can be computed in either of two ways.
1.. Convert each unit into feet and multiply one by the other
16" X 16" = 1.333' X 1.333'
= 1.778 SQ. FT.
or
2.. Multiply unit "A" in inches by unit "B" in inches and divide by 144
= 16" X 16" = 256 / 144 = 1.778 SQ. FT.
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Area of a rectangle is equal to length x width.15 feet x 16 feet = (15 x 16) square feet = 240 square feet
(16" x 16") = 256 square inches(256 square inches) / (144 square inches per square foot) = 1 and 7/9 square feet
Divide both sides by 12 to change to feet:- 8/12 times 16/12 = 8/9 square feet
10' x 16' is not a square but a rectangle and the diagonal is square root of (10^2 + 16^2) = square root of (100 + 256) = square root of 356 which is 18.867 feet
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