A rectangle is a two dimensional object: height, width and length are three dimensions.
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Volume = length times width times height = length x width x height In our case the volume = 20 x 14 x 8 = 2240 cubic feet
W = width of rectangle L = length of rectangle A = area of rectangle W x L = A (L+11) x L = A L squared + 11 L - 1302 = 0 solve for L by quadratic equation or by factoring: (L-31)(L +42) = 0 L = 31 W = L+11 = 42
The one alternative to find the area of a rectangle is when you are given the length of one diagonal and its slope.
A line segment has length. That is its only dimension. It does not have any width, or height or depth.
To have 12 same size squares in a rectangle the grid of squares will be 1x12, 2x6 or 3x4. This means that the ratio of the length to the width is either 1:12, 2:6, 3:4, 4:3, 6:2 or 12:1. If the ratio of the length to width is none of those, then 12 same-size squares cannot fit.