30 square inches converts to about 193.55 square centimeters.
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51 inches wide x 30 inches long = 10.625 square feet.
15 square feet.
30" x 40" = 1,200 square inches.
3 x 30 = 90 square feet. 1 square foot = 144 square inches (12 x 12) So 90 square feet = 12,960 square inches
It is: 30*30 = 900 square inches