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[" 9.The angle of elevation of the top o...

[" 9.The angle of elevation of the top of the tower is "45^(@)" on walking up a slope inclined at an angle of "30^(0)],[" to the horizontal a distance "20mt" ,the angle of elevation of top of tower is observed to be "60^(@)" .Then the "],[" height of the tower "],[[" 1) "10(sqrt(3)+1)mt," 2) "20(sqrt(3)+1)mt," 3) "100sqrt(3)mt," 4) "50(3+sqrt(3))mt]]

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