A ski slope is 250 yards long with a vertical drop of 100 yardsfind the angle of depression of the slope?

The angle of depression is equal to the angle of elevation, so use the sine ratio to find the angle.

sine = opposite (the vertical drop) divided by the hypotenuse (the ski slope)

sine = 100/250 = 2/5 or 0.4

sine-1(0.4) = 23.57817848 degrees which is about 24 degrees