To find the dimensions of the swimming pool with the no-slip surface around it, we need to subtract the width of the no-slip surface from the overall dimensions.
Given that the rectangular pool has dimensions 12 ft by 15 ft, and the no-slip surface has a width of 3 ft all around it, the dimensions of the pool including the no-slip surface would be:
Length: 12 ft + 2*(3 ft) = 12 ft + 6 ft = 18 ft
Width: 15 ft + 2*(3 ft) = 15 ft + 6 ft = 21 ft
Therefore, the swimming pool with the 3-ft wide no-slip surface around it would have dimensions of 18 ft by 21 ft.
a 12-ft-by-15-ft rectangular swimming pool has a 3-ft-wide no-slip surface around it
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