A speeding run is 400 yards long with a vertical drop of 30.5 yards. Find the angle of depression of the run

When you set up your right triangle, your opposite leg will be the 30.5 and your hypotenuse will be the 400. Knowing that sin (theta) = opposite/hypotenuse, you can take the arcsine of the ratio and get your theta value. In this case, theta = 4.37 degrees