5. Suppose that Mike and Dave are making measurements for the road-paving crew.
They need to know how much the land slopes downward along a particular stretch
of road. Dave walks 80 feet from Mike and holds up a long pole, perpendicular to
the ground, that has markings every inch along it. Mike looks at the pole through a
sighting instrument. Looking straight across, parallel to the horizon, Mike sights a
point on the pole 50 inches above the ground-call it point A. Then Mike looks
through the instrument at the bottom of the pole, creating an angle of depression.
Which is the angle of depression or slope of the road, to where Mike is standing?