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12 August, 10:19

The base of a 13 foot ladder is 5 feet away from the wall. How far up the wall does the ladder reach?

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Answers (2)
  1. 12 August, 11:51
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    The ladder would be 12 feet up the wall.
  2. 12 August, 12:52
    0
    let x be how far up the wall ladder reaches

    by Pythagoras theorem

    x^2+5^2=13^2

    x^2 = (13^2) - (5^2)

    x = square root of 144

    x = 12 or x = -12 (rej, x>0)

    hence ladder reaches 12 foot up the wall
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