A surveyor uses an instrument whose lens is 1.6 m above horizontal ground. From a point 25 m horizon

Question

A surveyor uses an instrument whose lens is 1.6 m above horizontal ground. From a point 25 m horizontally from a vertical flagpole, the angle of elevation of its top is $18^\circ$. Calculate the height of the flagpole. The surveyor moves to a point 7 m horizontally from the flagpole. Calculate the new angle of elevation from lens level. $\text{surveyor}$ $\text{25 m}$ $18^\circ$ $\text{flagpole}$

Accepted Answer

(a) $9.72$ m; (b) $49.2^\circ$.

Right-triangle trigonometry

Right-triangle trigonometry

Solution:

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