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A 11​-foot ladder is placed against a vertical wall of a​ building, with the bottom of the ladder standing on level ground 9 feet from the base of the building. How high up the wall does the ladder​ reach?
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A 11​-foot ladder is placed against a vertical wall of a​ building, with the bottom of the ladder standing on level ground 9 feet from the base of the building. How high up the wall does the ladder​ reach?

User SaintTail
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It is 11^2-9^2 which equals 40 then you do root 40 which is 2root10
User Innovin
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