Well, honey, to find the square footage of a rectangle, you multiply the length by the width. So for a 3ft by 5ft rectangle, you'd do 3 x 5 and get 15 square feet. Easy peasy lemon squeezy!
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That would be 63 square feet
You cannot. A 3ft x 3ft square has an area of 9 square feet. 9 does not divide 1200 evenly.
8 inches = 8/12 ft = 2/3 or .66 ft 20ft X 21ft = 420ft2 X .66ft or 2/3ft = 280ft3 (feet cubed )
64 square yards. One square yard is 3ft x 3ft = 9 sq ft. So 576/9 = 64. Also. the square root of 576 = 24. So 24 ft x 24 ft = 576 sq ft. 24 ft = 8 yards, 8 yds x 8 yds = 64 sq yds.
16-ft x 70-ft = 1,120 square feet