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The top of a ladder is leaning on a building at a point 12 feet above the ground; the bottom of the ladder is 5 feet from the base of the building. What is the length of the ladder?

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a^2 + b^2 = c^2

12^2 + 5^2 = c^2

144 + 25 = c^2

169 = c^2

13 = c

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