12' x 21' (252 square feet) = 28 sq. yards.
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189 square feet. (multiply square yards by 3 to get square feet)
Multiply the two dimensions to get the area. The calculation will give you 252 square feet which converts to 28 square yards.
(21/3) x (6/3) = 14 square yards
8 ft X 8 ft. is 64 sq. feet = 21 yards ( 3 feet are in a yard)Yars are 3 feet so they technically can't be square 21 yards and 1 yard on the side extra
78.2 yards