A rectangle measuring 18 by 12 inches has an area of 216 square inches.
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To get the area of a square (including rectangles), multiply side (12) x side (9), which equals 108 inches.
A rectangle measuring 12 inches by 8 inches has a perimeter of 40 inches, since 12 + 12 + 8 + 8 = 40 inches.
12 inches in a foot, so 12:1 (12 to 1) obviously...
144 square inches.
just by measuring it by 12 inches every time- chidimma agbugba