2 x 5 = 10 po angle of depression is 10
Incorrect:-) You don't multiple the height and base to get the angle of depression :-)
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Angle of Depression = Angle of Elevation

Tangent = opposite / adjacent

Tangent = 2 miles/5 miles
            = 0.4

tan ^{-1} =0.4
                   = 21.801 degrees  or 22. degrees, angle of depression

Using your scientific calculator to find the angle whose tangent is 0.4:
1) Press 0.4
2) Press Shift key (or end)
3) Press tan

(Choose degrees over radians)