Solution to the RR Track Problem

In the view from above we are looking down on the "drawing". The line labelled "plane of the drawing" might be the top edge of a piece of paper.

In the side view we are looking at the side of the "drawing". The line labelled "plane of the drawing" might be the right edge of a piece of paper.

For convenience, let's place an x-axis along the bottom of the "drawing" and a y-axis along the left side. Consider the points, P and Q, where rays from points A and B (on the first railroad tie) intersect the "drawing" (as shown above). We can measure the values of x1, x2, and y . . .

. . . and then plot the points (x1,y) and (x2,y). These are the coordinates of the points P and Q on the "drawing".

Repeat the procedure for the other railroad ties.


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