The angle of view

Determine the angle of view at which the observer sees a rod 16 m long when it is 18 m from one end and 27 m from the other.

Correct result:

A =  34.9193 °

Solution:

a=16 m b=18 m c=27 m  a2=b2+c22 b c cosA  x=a2+b2+c22 b c=162+182+2722 18 27=7979720.82  A=180πarccos(x)=180πarccos(0.82)=34.9193=345510"

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