The book Practical Mathematics for Beginners was written by author Frank Castle Here you can read free online of Practical Mathematics for Beginners book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Practical Mathematics for Beginners a good or bad book?
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To obtain the square of a fractional number some difficulty would be experienced in noting the coincidence of divisions on A and D, separated as they are by the slide ; in this case we can make use of the runner, thus : Set the runner to coincide with the given number on the scale /), and, by its means, read off the square of the number on scale SLIDE RULE. 149 A. In this manner, having obtained the square, the fourth, or any even power, can be obtained. Square root by the slide rule. In extrac...ting square roots the process for involution is reversed. 'Hie number, the root of which is required, is found on the scale A, and its root is, as before, found directly below. The runner enables the coincidence of the two divisions denoting the number and its root to be readily obtained. As shown on p. 225, the area of a circle is 3*1416 xr, or *7854cP, where r is the radius and d the diameter of the given circle. Conversely, if the area of a circle is given, the diameter can be obtained from : diameter =V^.
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