A gas pipe under a river is 196.8 ft below the surface at its lowest point as shown in the drawing.?

Question

If the angle of depression of the pipe is 4.962° , then what is the distance from point A to point B on the surface of the water? What is the length of the pipe between points A and B? Round to the nearest foot.

Answer 1

C_____B

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A

Not knowing the term, "angle of depression", assuming it is the angle at A, then this is simple trig.  The relationship is

tangent (angle) = CB/CA

so CB = CAtan(angle) or 196.8*tan(4.962)

AB^2 = (CB^2 + CA^2)

Answer 2

No... I call BS on this... nobody could measure that angle to 3 decimal places, and nobody would decimalize their feet that way.