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Illustration of a hot air balloon above a road, with lines showing angles of depression to points on the road, labeled 17, 13, and 14 degrees.

Illustration of a hot air balloon above a road, with lines showing angles of depression to points on the road, labeled 17, 13, and 14 degrees.

A hot-air balloon is floating above a straight road. To estimate their height above the ground, the balloonists simultaneously measure the angle of depression to two consecutive mileposts on the road on the same side of the balloon. The angles are found to be 17 degrees and 13 degrees. See more