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P = the distance around a figure. A = the surface it takes up.
Assume there are no lines through a given point that is parallel to a given line or assume that there are many lines through a given point that are parallel to a given line. There exist a line l and a point P not on l such that either there is no line m parallel to l through P or there are two distinct lines m and n parallel to l through P.
The direction of missing endpoint is the same as the direction from the known end point to the midpoint. The distance from the midpoint to the missing endpoint is the same as the distance from the known end point to the midpoint. In coordinate geometry it is simple. If the known end point is (p, q) and the mid point is (r, s) then the missing point is (2r - p, 2s - q).
If p=(-7) and d=(-1) then the distance from p to d is determined by the distance formula for the one dimensional coordinate line:D=(x2-x1) d=x2, p=x1D=(-1)-(-7) = (-1)+7 = 6The positive number means the direction from p to d is from left to right on the coordinate line.