The answer has a meaning only in 4-dimensional space. 10 sq ft * 7 sq ft = 70 quartic feet.
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30 x 10 = 300 sq. ft. 10*30=300 therefore it is 300 sq. ft.
10 * 10 = 100 square feet!
Top = 5 x 3 = 15 sq ft Bottom = 5 x 3 = 15 sq ft 2 sides = 5 x 7 = 35 sq ft each other 2 sides = 3 x 7 = 21 sq ft each Total cardboard = 142 square feet Surface area = 142 sq ft inside, and 142 sq ft outside.
16 ft x 7 ft = 16 x 7 square ft = 112 sq ft
9 ft 6 in x 11 ft 7 in = 9.5 ft * 11.583... ft = 110.04166.. sq ft = 110.04166.. /9 sq yards = 12.227 sq yards, approx.