Help with Math homework please help, Angle of depression?

1. Draw a diagram

2. Tan (90-21) x 1000 = 2605.09

3. Tan (90-28) x 1000 = 1880.73

2605.09 - 1880.73 = 724.36

Angle of depression - If you look straight out and then down the angle that you looked down would represent the angle of depression. What I really needed here was the cotangent and Tan(90 -x) = cotangent. I could also have calculated the cotangent directly: Since tan x = 1/cotangent then

1000/tan 21 = 2605.09.

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