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 answer:

α =  34.9193 °

Step-by-step explanation:

a=16 m b=18 m c=27 m  a2=b2+c22 b c cosα  x=2 b ca2+b2+c2=2 18 27162+182+272=9727970.82  α=π180°arccosx=π180°arccos0.82=34.9193=34°5510"

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