Question:
The angle of elevation of the top of vertical tower standing on a horizontal plane is observed to be $45^{\circ}$ from a point $\mathrm{A}$ on the plane. Let $\mathrm{B}$ be the point 30 $m$ vertically above the point $A$. If the angle of elevation of the top of the tower from $B$ be $30^{\circ}$, then the distance (in m) of the foot of the tower from the point $A$ is:
Correct Option: , 2
Solution:
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