jee-main 2015 Q76

jee-main · India · 04apr Sine and Cosine Rules Heights and distances / angle of elevation problem

If the angles of elevation of the top of a tower from three collinear points $A , B$ and $C$ on a line leading to the foot of the tower are $30 ^ { \circ } , 45 ^ { \circ }$ and $60 ^ { \circ }$ respectively, then the ratio $AB : BC$, is
(1) $2 : 3$
(2) $\sqrt { 3 } : 1$
(3) $\sqrt { 3 } : \sqrt { 2 }$
(4) $1 : \sqrt { 3 }$

If the angles of elevation of the top of a tower from three collinear points $A , B$ and $C$ on a line leading to the foot of the tower are $30 ^ { \circ } , 45 ^ { \circ }$ and $60 ^ { \circ }$ respectively, then the ratio $AB : BC$, is\\
(1) $2 : 3$\\
(2) $\sqrt { 3 } : 1$\\
(3) $\sqrt { 3 } : \sqrt { 2 }$\\
(4) $1 : \sqrt { 3 }$

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