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1. |
A guard observes an enemy boat, from an observation tower at a height of 180 metre above sea level, to be at an angle of depression of 6°. The distance of the boat from the foot of the observation tower is |
A. | 180 metre |
B. | 180√3 metre |
C. | 60√3 metre |
D. | 60 metre |
Answer» D. 60 metre | |