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  2. Antipodes - Wikipedia

    en.wikipedia.org/wiki/Antipodes

    Here the blue areas are the reflections of the Eastern Hemisphere. In geography, the antipode (/ ˈæntɪˌpoʊd, ænˈtɪpədi /) of any spot on Earth is the point on Earth's surface diametrically opposite to it. A pair of points antipodal (/ ænˈtɪpədəl /) to each other are situated such that a straight line connecting the two would pass ...

  3. Additive inverse - Wikipedia

    en.wikipedia.org/wiki/Additive_inverse

    In a vector space, the additive inverse −v (often called the opposite vector of v) has the same magnitude as v and but the opposite direction. [9] In modular arithmetic, the modular additive inverse of x is the number a such that a + x ≡ 0 (mod n) and always exists. For example, the inverse of 3 modulo 11 is 8, as 3 + 8 ≡ 0 (mod 11). [10]

  4. Complementary colors - Wikipedia

    en.wikipedia.org/wiki/Complementary_colors

    Complementary colors may also be called "opposite colors". Which pairs of colors are considered complementary depends on the color theory one uses: Modern color theory uses either the RGB additive color model or the CMY subtractive color model, and in these, the complementary pairs are red–cyan, green–magenta (one of the purples), and blue ...

  5. List of ship directions - Wikipedia

    en.wikipedia.org/wiki/List_of_ship_directions

    Bilge: the underwater part of a ship between the flat of the bottom and the vertical topsides [13] Bottom: the lowest part of the ship's hull. Bow: front of a ship (opposite of "stern") [1] Centerline or centreline: an imaginary, central line drawn from the bow to the stern. [1] Fore or forward: at or toward the front of a ship or further ahead ...

  6. Opposition (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Opposition_(astronomy)

    Opposition (astronomy) In positional astronomy, two astronomical objects are said to be in opposition when they are on opposite sides of the celestial sphere, as observed from a given body (usually Earth). A planet (or asteroid or comet) is said to be "in opposition" or "at opposition" when it is in opposition to the Sun.

  7. Antithesis - Wikipedia

    en.wikipedia.org/wiki/Antithesis

    Antithesis (pl.: antitheses; Greek for "setting opposite", from ἀντι- "against" and θέσις "placing") is used in writing or speech either as a proposition that contrasts with or reverses some previously mentioned proposition, or when two opposites are introduced together for contrasting effect. [1][2] Antithesis can be defined as "a ...

  8. Opposite (semantics) - Wikipedia

    en.wikipedia.org/wiki/Opposite_(semantics)

    Opposite (semantics) In lexical semantics, opposites are words lying in an inherently incompatible binary relationship. For example, something that is male entails that it is not female. It is referred to as a 'binary' relationship because there are two members in a set of opposites. The relationship between opposites is known as opposition.

  9. Hypotenuse - Wikipedia

    en.wikipedia.org/wiki/Hypotenuse

    Hypotenuse. In geometry, a hypotenuse is the side of a right triangle opposite the right angle. [1] It is the longest side of any such triangle; the two other shorter sides of such a triangle are called catheti or legs. The length of the hypotenuse can be found using the Pythagorean theorem, which states that the square of the length of the ...