You have to multiply the two dimensions to get the area. In this case the answer will be 238 square feet. Divide by 9 to get 26.44 square yards.
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There are: 14*17 = 238 square feet
For a 17' x 17' by 4" slab you will need 3.6 cubic yards. If you increase the thickness to 6" you would need 5.4 cubic yards.
17 x 20 = 340 square feet
136 square feet.
Multiply width by length to get the area. The answer would be 136 square feet.