# arrow_back The angle of elevation of the top of cell phone tower $B$ from the top of cell phone tower $A$ is $30^{\circ}$. The angle of depression of the foot of cell phone tower B from the top of cell phone tower A is $60^{\circ}$.

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The angle of elevation of the top of cell phone tower $B$ from the top of cell phone tower $A$ is $30^{\circ}$. The angle of depression of the foot of cell phone tower B from the top of cell phone tower A is $60^{\circ}$. The height of cell phone tower $\mathrm{B}$ is $100 \mathrm{~m}$. The foot of cell phone tower $\mathrm{A}$ and the foot of cell phone tower $\mathrm{B}$ are in the same horizontal plane. The height of cell phone tower $\mathrm{A}$ is
(A) $60 \mathrm{~m}$
(B) $65 \mathrm{~m}$
(C) $70 \mathrm{~m}$
(D) $75 \mathrm{~m}$

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