A fire fighter's ladder of length 13m was kept at a distance of 5 m from a building to reach a window on the building . At what height is the window from the ground ?
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https://www.meritnation.com/ask-answer/question/a-ladder-of-length-13m-was-kept-at-a-distance-of-5mfrom-t/the-triangle-and-its-properties/9726499
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