A right triangle is made, where the lengths of Lot H and K are the legs, and the length of Lot S is the hypotenuse. Using Pythagorean theorem:
S² = H² + K²
125² = 75² + K²
15625 = 5625 + K²
15625 - 5625 = K²
10000 = K²
√10000 = K
100 ft = K
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