Area = length x height
If you have a room three feet long and four feet wide, the area is 12 feet squared.
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L = 14 and W = 2 would give an area (A) of 28, or 7 (L) x 4 (W) = 28 (A)
the formula for a rectangle is L x W where L is length and W is width.
Rectangle area = l x w = 6 units x 4 units = 24 square units
V= l x w x h
L x W x H = volume. So 18 x 5 x 6 = 540 square inches.