You have to multiply the two dimensions to get the area. In this case the answer will be 196 square feet. Divide that by 9 gives you 21.78 square yards.
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170/9 = 18.9 square yards
1,440 square feet or 160 square yards.
At least 31.77 square yards are needed.
depends on the depth that you need to cover the 1200 square feet (area) to. there are 3 foot to 1 yard (1 foot=3 yards). so 1 square foot = 9 square yards (3x3). 1200 square feet = 1200 x9 = 10,800 square yards. you then multiply the 10,800 by the amount of yards (depth) that you want to cover the area to.
Broken down as follows: 30 feet = 10 yards 36 feet = 12 yards 10 x 12 = 120 square yards