Maths

posted by Shar

A ladder 15m long reaches a window which is 9m above the groubd on one side of the street. Keeping its foor at the same point, the ladder is turned to the other side of the street to reach a window 12m high. The width of the street is ______ meter?

  1. Steve

    Remember your basic 3-4-5 right triangle. Scale it up by 3 and you have 9-12-15.

    Now draw your diagram, and all should be clear.

  2. Anu

    21

  3. Reddy

    Length of ladder=AC=15m
    Height of window from ground
    in first case AB=9m
    ABC is right angled triangle
    Ac^2=AB^2+BC^2
    BC=12m
    In second case
    Let CE be length of ladder=15m
    Height of window from ground=DE=12m
    Triangle CDE is a right angled triangle
    CE^2=DE^2+CD^2
    CD=9m
    Width of street=BC+CD=9+12=21m

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