9ft by 9ft is the same as 3 yards by 3 yards so the answer is 9 square yards.
At least 31.77 square yards are needed.
348 square feet are 38.666667 square yards.
400 square yards. This is because there are 9 square feet in a square yard, and there are 3600 square feet of carpet needed to cover the 60' x 60' floor.
6' x 9' (54 square feet) = 6 square yards of tiles needed.
28' x 14' (392 square feet) = 43.5 square yards of carpet needed.
13' x 15' (195 square feet) = 21.67 square yards of carpet needed.
14 square yards (assuming you are purchasing whole square yards)
13.333 square yards.
784 square feet requires a minimum of 87.1 square yards of carpet.
At least 622.2 square yards of sod are needed to cover that area.
20 square yards are needed
170/9 = 18.9 square yards