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March 26, 2017

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On the horizontal plane there is a vertical tower is a vertical tower and the shadow of its is found to be 40 m longer.when sun's altitude is 30 degree than what it is 60 degree.find the height of tower.

  • Maths - ,

    draw a diagram. Let the height of the tower be h, and the length of shadow for a 60deg sun be x. Then we have

    h/x = √3
    h/(x+40) = 1/√3

    √3 x = (x+40)/√3
    3x = x+40
    x = 20
    h = 20√3 = 34.64m

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