13 ft by 23 ft = 299 ft2 and one standard sheet of plywood is 4 ft by ft = 32 ft2. 299 / 32 = 9.34 sheets, so you will need to purchase 10 sheets of plywood.
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9 A square yard is 3 feet across and 3 feet long. 3x3=9
11 + 9 + 11 + 9 = 40 feet
199.5 square feet
4 inches = 1/3rd foot.350 x 3 = 4 inches wide by 1,050 feet long.
A 140 feet long by 50 feet wide rectangle needs 380 feet of fencing.