There is no correct answer to this because "square feet" is a measure of area, but 14 feet is a measure of length. In other words, 14 feet is a distance, e.g. the car is 14 feet long. Square feet is an area, e.g. the back yard is 14 feet long by 10 feet wide so it has an area of 140 square feet.
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A 14 x 14 foot square is 196 square feet.
There are 9*14 = 126 square feet
168 square feet
196 ft²
14 × 60 = 840 square feet.