posted by Chetan Munsell on .
The angle of elevation to the top of a building from a point on the ground is 39 degrees. From a point 50 feet closer to the building, the angle of elevation is 48 degrees. What is the height of the building?
draw the figure. You have two triangles. let x be the distance to the closer point, from the building.
set them equal, and solve for h.