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  2. Quadrant (plane geometry) - Wikipedia

    en.wikipedia.org/wiki/Quadrant_(plane_geometry)

    Signs of trigonometric functions in each quadrant. In the above graphic, the words in quotation marks are a mnemonic for remembering which three trigonometric functions (sine, cosine and tangent and their reciprocals) are positive in each quadrant. The expression reads "All Science Teachers Crazy" and proceeding counterclockwise from the upper ...

  3. atan2 - Wikipedia

    en.wikipedia.org/wiki/Atan2

    atan2(y, x) returns the angle θ between the positive x-axis and the ray from the origin to the point (x, y), confined to (−π, π].Graph of ⁡ (,) over /. In computing and mathematics, the function atan2 is the 2-argument arctangent.

  4. Cartesian coordinate system - Wikipedia

    en.wikipedia.org/wiki/Cartesian_coordinate_system

    The black dot shows the point with coordinates x = 2, y = 3, and z = 4, or (2, 3, 4). A Cartesian coordinate system for a three-dimensional space consists of an ordered triplet of lines (the axes ) that go through a common point (the origin ), and are pair-wise perpendicular; an orientation for each axis; and a single unit of length for all ...

  5. Orthant - Wikipedia

    en.wikipedia.org/wiki/Orthant

    In geometry, an orthant [1] or hyperoctant [2] is the analogue in n-dimensional Euclidean space of a quadrant in the plane or an octant in three dimensions. In general an orthant in n-dimensions can be considered the intersection of n mutually orthogonal half-spaces. By independent selections of half-space signs, there are 2 n orthants in n ...

  6. TRIAC - Wikipedia

    en.wikipedia.org/wiki/TRIAC

    Main Terminal 1 (MT1) and Main Terminal 2 (MT2) are also referred to as Anode 1 (A1) and Anode 2 (A2) respectively. [2] The relative sensitivity depends on the physical structure of a particular triac, but as a rule, quadrant I is the most sensitive (least gate current required), and quadrant 4 is the least sensitive (most gate current required).

  7. List of medical abbreviations: L - Wikipedia

    en.wikipedia.org/wiki/List_of_medical...

    left lower quadrant: LM: left main LMA: left mentoanterior (fetal position) laryngeal mask airway LMCA: left main coronary artery: LMD: local medical doctor: LMP: last menstrual period—first day of the menstrual period low malignant potential LMWH: low-molecular-weight heparin: LN: lymph node Logical Observation Identifiers Names and Codes ...

  8. Is right rib pain a sign of something serious? When to call ...

    www.aol.com/news/rib-pain-sign-something-serious...

    The right upper quadrant of the abdomen contains bones, muscles, organs and other tissues. ... An isolated ouch under your right ribs doesn’t mean your liver is diseased, but it could be a sign ...

  9. List of mathematical abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical...

    Re – real part of a complex number. [2] (Also written.) resp – respectively. RHS – right-hand side of an equation. rk – rank. (Also written as rank.) RMS, rms – root mean square. rng – non-unital ring. rot – rotor of a vector field. (Also written as curl.) rowsp – row space of a matrix. RTP – required to prove.