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12 feet.

It is actually pretty easy, if you remember that a 3x4x5 triangle is always a right angle. divide by 3 and you have the 3 and 5 all you need is the four multiplied by 3.

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Q: A 15 foot ladder is leaning against a 30 foot wall The bottom end of the ladder is 9 feet from the wall How many feet above the ground does the ladder touch the wall?
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