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UPSC CDS 2 2021 Math Paper

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Question : 36

Total: 100

From an aeroplane flying about a river at an altitude of 1200m, it is observed that the angles of depression of opposite points on the two banks of a river are 30∘ and θ. If the width of the river is 3000m, then which one of the following is correct ?

θ<30∘
30∘<θ<45∘
45∘<θ<60∘
60∘<θ<90∘

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