It can also be solved for $50 less (4900/7000) using a triangle below (from roadway points 3 and 4 down to the pillar) and a one-unit-tall triangle, above (from roadway point 1 [the left-most], up and over to one unit above point 2, then down and over to point 3, with a vertical support from point 2 to the peak). Sorry, don’t know the right way to attach a picture.
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