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Posted by on Monday, August 27, 2012 at 9:48am.

Need help.....
A child of height 1.2 metres stands 3 metres from the foot of a lamp post of height 2.8 metres, at the top of which there is a small source which can be considered as a point. What is the length of the shadow cast by the child upon the ground?

  • math - , Monday, August 27, 2012 at 10:16am

    make a sketch
    let the length of the child's shadow be x m
    from the similar triangles....

    1.2/x = 2.8/(x+3)
    2.8x = 1.2x + 3.6
    1.6x = 3.6
    x = 2.25

  • math - , Monday, August 27, 2012 at 10:55am

    thanks for your help

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