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  2. Square root of 2 - Wikipedia

    en.wikipedia.org/wiki/Square_root_of_2

    The square root of 2 (approximately 1.4142) is the positive real number that, when multiplied by itself or squared, equals the number 2.It may be written in mathematics as or /.

  3. Square root - Wikipedia

    en.wikipedia.org/wiki/Square_root

    Notation for the (principal) square root of x. For example, √ 25 = 5, since 25 = 5 ⋅ 5, or 5 2 (5 squared). In mathematics, a square root of a number x is a number y such that =; in other words, a number y whose square (the result of multiplying the number by itself, or ) is x. [1]

  4. Indian mathematics - Wikipedia

    en.wikipedia.org/wiki/Indian_mathematics

    Using the improved series to derive a rational expression, [86] 104348/33215 for π correct up to nine decimal places, i.e. 3.141592653. Use of an intuitive notion of limit to compute these results. [86] A semi-rigorous (see remark on limits above) method of differentiation of some trigonometric functions. [72]