Question

short note on rulers in computer ​

Answer 1

The slide rule, also known colloquially in the United States as a slipstick, is a mechanical analog computer. The slide rule is used primarily for multiplication and division, and also for functions such as exponents, roots, logarithms and trigonometry, but typically not for addition or subtraction.

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Answer 2

The ruler is a measurement tool found with some software programs that allow the program's user to align graphics, text, tables, or other elements on a page. When enabled, the horizontal ruler appears at the top of the document, and the vertical ruler is on the left-side of the document.