Tower height h = 450 m, Angle of depression 1 = 60°, Angle of depression 2 = 30°.

For a tower of height h and angles 60° and 30°, the distance between objects is h × ($\sqrt{3}$ - 1/$\sqrt{3}$), which simplifies to (2h/$\sqrt{3}$) or (2h$\sqrt{3}$)/3.

Many students confuse angle of elevation and depression, but since they are complementary, they result in the same triangle geometry; do not mistake the 30° angle for the one closer to the tower.

This concept of distance between two points based on tower height is a staple in civil engineering surveying and RPF/ALP technical exam sections.