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  2. Insert card - Wikipedia

    en.wikipedia.org/wiki/Insert_card

    Non-rare to rare cards that are randomly inserted into packs can be inserted in various ratios like 1 per 24 packs. Not only is an Insert Card often different from the main set, but its numbering tends to be different (examples: numbers on the back can be SP1 or SP2).

  3. Christmas card - Wikipedia

    en.wikipedia.org/wiki/Christmas_card

    In the UK, Christmas cards account for almost half of the volume of greeting card sales, with over 668.9 million Christmas cards sold in the 2008 festive period. [14] In mostly non-religious countries (e.g. Czech Republic), the cards are called New Year Cards ; they are sent before Christmas and the emphasis (design, texts) is mostly given to ...

  4. Special right triangle - Wikipedia

    en.wikipedia.org/wiki/Special_right_triangle

    A "side-based" right triangle is one in which the lengths of the sides form ratios of whole numbers, such as 3 : 4 : 5, or of other special numbers such as the golden ratio. Knowing the relationships of the angles or ratios of sides of these special right triangles allows one to quickly calculate various lengths in geometric problems without ...

  5. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    The golden ratio φ and its negative reciprocal −φ −1 are the two roots of the quadratic polynomial x 2 − x − 1. The golden ratio's negative −φ and reciprocal φ −1 are the two roots of the quadratic polynomial x 2 + x − 1. The golden ratio is also an algebraic number and even an algebraic integer.

  6. Ratio - Wikipedia

    en.wikipedia.org/wiki/Ratio

    When a ratio is written in the form A:B, the two-dot character is sometimes the colon punctuation mark. [8] In Unicode, this is U+003A : COLON, although Unicode also provides a dedicated ratio character, U+2236 ∶ RATIO. [9] The numbers A and B are sometimes called terms of the ratio, with A being the antecedent and B being the consequent. [10]

  7. Irreducible fraction - Wikipedia

    en.wikipedia.org/wiki/Irreducible_fraction

    An irreducible fraction (or fraction in lowest terms, simplest form or reduced fraction) is a fraction in which the numerator and denominator are integers that have no other common divisors than 1 (and −1, when negative numbers are considered). [1]