The volume of a 6 in x 18 in x 6 in object is 648 in3.
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The area of a square 6in X 6in is 36in.
The area of a square or rectangle is length times the width. Example: 6in x 6in square is 6 x 6 = 36 square inches (can be written as 36in2).
6" x 18" x 6" = 648 cubic inches = 0.375 cubic foot
It is 72 cubic feet.
L x W x H = volume. So 18 x 5 x 6 = 540 square inches.