s2 + (s - 17)2 = 252
s2 + s2 - 34s + 289 = 625
2s2 - 34s - 336 = 0
s2 - 17s - 168 = 0
(s - 24)(s + 7) = 0
s - 24 = 0
s = 24
24 - 17 = 7
24 feet and 7 feet
s + 7 = 0
s = -7
Because we measure using positive numbers, this answer is disregarded.