When you have two numbers separated by the word "by", this means that those numbers are the width and height.
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Its height times width must equal 12. The rectangle could be: The height could be 1 and the width 12. The height could be 3 and the width 4. The height could be 6 and the width 2. But it could not have a height of 8 and width of 4 (since 8×4 = 32 square units of area).
4 feet high by 8 feet wide = diagonal of 107.28 inches.
It is 36 cubic inches.
10 x 8 x 4 = 320 inches cubed
10 in