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[Phys-L] Real World Geometry

The topic of real world applications of school topics reminds me of
some basic geometry.
Drug smugglers were recently depicted in the attempt to scale a border
wall in a vehicle - which looked like a Jeep Grand Cherokee,
using a pair of ramps pitched at about 45 degrees.
The modus was particularly straight forward: they placed two ramps,
one on either side of the wall, and drove the vehicle up the ramp
to the peak. As the vehicle pitched down to descend, it stuck,
and so they abandoned it, escaping on foot.

Supposing their vehicle had a wheel base of ten feet, and a road
clearance of one foot, how could they have constructed a ramp
so as not to get hung up at the peak while maintaining
at most 45 degree ascent?

Brian W