Prove that the angle subtended by an arc of a circle at the centre is double the angle subtended by it at any point on the remaining part of the circle
The height of a multistorey building is 190m and the depth of its base is 10 m. A lift in a building moves at the rate of 10m/15 seconds.If a man starts from terrace, how long will it take him to reach at bottom of the basement?
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