Question 243354
Visualize a triangle where the hypotenuse is from Virginia's apartment down to either the far side of the grounds or the pool.  The distance across the ground is either 400 or 600.  The distance vertically up the side of the building is 180.  So apply the Pythagorean formula:  c^2 = a^2 + b^2.  We know a = 180 and b = 400 or 600.
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c^2 = (180)^2 + (400)^2
c^2 = 32,400 + 160,000 = 192,400
c = sqrt (192,400) = 438.63
.
c^2 = (180)^2 + (600)^2
c^2 = 32,400 + 360,000 = 392,400
c = sqrt(392,400) = 626.41