Place the triangle on a cartesian system with the right angle of the room's corner at the origin. The railing fits on a line, . The segment length labeled, "x" , is on the line , maybe now a bad choice of naming for variables, perpendicular to the railing.
Find the other endpoint of "x"; which is the intersection point of and .
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Multiply L&R by 12.
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Intersection point is ( -72/25, -96/25 ).
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Final task is USE THE DISTANCE FORMULA to find distance between (0,0) and ( -72/25, -96/25 ).