The surface area (SA) of the rectangular prism is: SA = 2lw + 2ld + 2wd
However, the pool is without the top side, so the area of the top side should be excluded from the surface area of the pool. The surface area of the rectangular pool is: SA = lw + 2ld + 2wd
We know: SA = 210 ft² l = 9 ft w = 10 ft d = ?
210 = 9 * 10 + 2 * 9 * d + 2 * 10 * d 210 = 90 + 18d + 20d 210 - 90 = 38d 120 = 38d d = 120/38 d = 3.16 ft
