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  2. Angle - Wikipedia

    en.wikipedia.org/wiki/Angle

    Two angles that share terminal sides, but differ in size by an integer multiple of a turn, are called coterminal angles. The reference angle (sometimes called related angle) for any angle θ in standard position is the positive acute angle between the terminal side of θ and the x-axis (positive or negative).

  3. Terminal and nonterminal symbols - Wikipedia

    en.wikipedia.org/wiki/Terminal_and_nonterminal...

    In fact, the language defined by a grammar is precisely the set of terminal strings that can be so derived. Context-free grammars are those grammars in which the left-hand side of each production rule consists of only a single nonterminal symbol. This restriction is non-trivial; not all languages can be generated by context-free grammars.

  4. Modern Arabic mathematical notation - Wikipedia

    en.wikipedia.org/wiki/Modern_Arabic_mathematical...

    It is contested that the usage of Latin x in maths is derived from the first letter ش šīn (without its dots) of the Arabic word شيء šayʾ(un), meaning thing. [2] (X was used in old Spanish for the sound /ʃ/). However, according to others there is no historical evidence for this. [3] [4] ص: From the Arabic letter ص ṣād

  5. Sine and cosine - Wikipedia

    en.wikipedia.org/wiki/Sine_and_cosine

    In mathematics, sine and cosine are trigonometric functions of an angle.The sine and cosine of an acute angle are defined in the context of a right triangle: for the specified angle, its sine is the ratio of the length of the side that is opposite that angle to the length of the longest side of the triangle (the hypotenuse), and the cosine is the ratio of the length of the adjacent leg to that ...

  6. Geometric terms of location - Wikipedia

    en.wikipedia.org/wiki/Geometric_terms_of_location

    Transverse – intersecting at any angle, i.e. not parallel. Orthogonal (or perpendicular) – at a right angle (at the point of intersection). Elevation – along a curve from a point on the horizon to the zenith, directly overhead. Depression – along a curve from a point on the horizon to the nadir, directly below.

  7. Belgium gives sex workers the same employment rights as other ...

    www.aol.com/belgium-gives-sex-workers-same...

    Sex workers in Belgium have been given the right to health insurance, maternity leave, sick pay and other employment benefits under a new world-first law.. The new legislation will allow sex ...

  8. Why Alabama must be viewed as College Football Playoff ...

    www.aol.com/why-alabama-must-viewed-college...

    Vanderbilt defensive back De'Rickey Wright (19) knocks Alabama running back Jam Miller (26) out of bounds just short of the goal line during the first half at FirstBank Stadium.

  9. Cathetus - Wikipedia

    en.wikipedia.org/wiki/Cathetus

    In a right triangle, a cathetus (originally from the Greek word Κάθετος; plural: catheti), commonly known as a leg, is either of the sides that are adjacent to the right angle. It is occasionally called a "side about the right angle". The side opposite the right angle is the hypotenuse. In the context of the hypotenuse, the catheti are ...