A flagpole is on a hill that makes an angle of 17° with the horizontal. How tall is the flagpole if its shadow is 21 meters down the slope when the angle of elevation of the sun is 31°?

Answer 1

It is important to draw a figure for this problem.

If the ground were level, the shadow of the pole would be 21 cos 17°.

The height of the pole then would be (21 cos 17°) tan 31°.