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2. Leibniz formula for π - Wikipedia

   en.wikipedia.org/wiki/Leibniz_formula_for_π

   Comparison of the convergence of the Leibniz formula ( ) and several historical infinite series for π. S n is the approximation after taking n terms. Each subsequent subplot magnifies the shaded area horizontally by 10 times. (click for detail) Leibniz's formula converges extremely slowly: it exhibits sublinear convergence.

3. Fraction - Wikipedia

   en.wikipedia.org/wiki/Fraction

   For example, in the fraction ⁠ 3 / 4 ⁠, the numerator 3 indicates that the fraction represents 3 equal parts, and the denominator 4 indicates that 4 parts make up a whole. The picture to the right illustrates ⁠ 3 / 4 ⁠ of a cake. Fractions can be used to represent ratios and division. [1]

4. List of formulae involving π - Wikipedia

   en.wikipedia.org/wiki/List_of_formulae_involving_π

   3.4 Machin-like formulae. 3.5 Infinite products. 3.6 Arctangent formulas. 3.7 Complex functions. ... For more on the fourth identity, see Euler's continued fraction ...

5. Pi - Wikipedia

   en.wikipedia.org/wiki/Pi

   The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

6. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   Cycles of the unit digit of multiples of integers ending in 1, 3, 7 and 9 (upper row), and 2, 4, 6 and 8 (lower row) on a telephone keypad Figure 1 is used for multiples of 1, 3, 7, and 9. Figure 2 is used for the multiples of 2, 4, 6, and 8.

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