If you mean points of (-2, -6) and (-2, 2) then it works out as 8
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7
Distance between (0,0) and (8,2): √((8-0)2+(2-0)2) = √(82+22) = √(64+4) = √(68) = 2√17 ~= 8.246
Points: (2, 2) and (8, -6) Distance: 10
Any two numbers that have a distance of 16 between them, such as 0 and 16, or -16 and 0, or -8 and 8, or 6 and 22.
If the engineer's eye is at ground level, then the distance to the point on the building underneath its highest point is 450/tan(22) ft. If the engineer was standing and his eyes were x ft above the ground, the distance is (450-x)/tan(22) ft.