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  2. Triangular number - Wikipedia

    en.wikipedia.org/wiki/Triangular_number

    Note that b will always be a triangular number, because 8T n + 1 = (2n + 1) 2, which yields all the odd squares are revealed by multiplying a triangular number by 8 and adding 1, and the process for b given a is an odd square is the inverse of this operation.

  3. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    The name derives from ELektronen KAlkulator, and it weighed around 8 kg (18 lb). It is the first calculator in the world which includes the square root function. Later that same year were released the ELKA 22 (with a luminescent display) [ 22 ] [ 24 ] [ 25 ] and the ELKA 25, with an built-in printer.

  4. Right triangle - Wikipedia

    en.wikipedia.org/wiki/Right_triangle

    A right triangle ABC with its right angle at C, hypotenuse c, and legs a and b,. A right triangle or right-angled triangle, sometimes called an orthogonal triangle or rectangular triangle, is a triangle in which two sides are perpendicular, forming a right angle (1 ⁄ 4 turn or 90 degrees).

  5. Incircle and excircles - Wikipedia

    en.wikipedia.org/wiki/Incircle_and_excircles

    [1] An excircle or escribed circle [ 2 ] of the triangle is a circle lying outside the triangle, tangent to one of its sides and tangent to the extensions of the other two . Every triangle has three distinct excircles, each tangent to one of the triangle's sides.

  6. Equilateral triangle - Wikipedia

    en.wikipedia.org/wiki/Equilateral_triangle

    An equilateral triangle is a triangle that has three equal sides. It is a special case of an isosceles triangle in the modern definition, stating that an isosceles triangle is defined at least as having two equal sides. [1] Based on the modern definition, this leads to an equilateral triangle in which one of the three sides may be considered ...

  7. Prime number - Wikipedia

    en.wikipedia.org/wiki/Prime_number

    If ⁠ ⁠ really is prime, it will always answer yes, but if ⁠ ⁠ is composite then it answers yes with probability at most 1/2 and no with probability at least 1/2. [132] If this test is repeated ⁠ n {\displaystyle n} ⁠ times on the same number, the probability that a composite number could pass the test every time is at most ⁠ 1 / 2 ...

  8. Triángulo (TV series) - Wikipedia

    en.wikipedia.org/wiki/Triángulo_(TV_series)

    Triángulo (English: Triangle) is a Mexican telenovela directed by Arturo Ripstein and Sergio Muñoz and produced by Ernesto Alonso for Televisa in 1992. [ 1 ] Daniela Castro and Eduardo Palomo starred as protagonists, while Kenia Gazcón, Guillermo García Cantú and Patricia Reyes Spíndola starred as antagonists.