QWhat is a slide rule?

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• A A mechanical doll that could write holding a quill pen ✔ ✖
• B A calculating instrument used for solving problems in proportion, trigonometry, multiplication and division ✔ ✖
• C A hand-operated analog computer for doing multiplication and division ✔ ✖
• D An instrument for calculating the area of a closed figure ✔ ✖

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