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  2. Quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Quadrilateral

    A quadric quadrilateral is a convex quadrilateral whose four vertices all lie on the perimeter of a square. [7] A diametric quadrilateral is a cyclic quadrilateral having one of its sides as a diameter of the circumcircle. [8] A Hjelmslev quadrilateral is a quadrilateral with two right angles at opposite vertices. [9]

  3. Multiple Choice (novel) - Wikipedia

    en.wikipedia.org/wiki/Multiple_Choice_(novel)

    Multiple Choice (Spanish: Facsímil, lit. 'Facsimile') is a novel published by the Chilean author Alejandro Zambra in 2014. Megan McDowell's English translation was published by Penguin Books in 2016. The novel uses the structure and questions of the Chilean Academic Aptitude Test as its organizing principle.

  4. Perfect (grammar) - Wikipedia

    en.wikipedia.org/wiki/Perfect_(grammar)

    Resultative perfect (referring to a state in the present which is the result or endpoint of an event in the past): "I have lost my pen-knife" (message: I still don't have it) Continuative perfect (past situations continuing into present): "I have always guided him" Anterior perfect (completed past situations, but with relevance to the present):

  5. Multiple choice - Wikipedia

    en.wikipedia.org/wiki/Multiple_choice

    A multiple choice question, with days of the week as potential answers. Multiple choice (MC), [1] objective response or MCQ(for multiple choice question) is a form of an objective assessment in which respondents are asked to select only the correct answer from the choices offered as a list.

  6. Square - Wikipedia

    en.wikipedia.org/wiki/Square

    Classification of quadrilaterals by their symmetry subgroups. [18] The 8-fold symmetry of the square is labeled as r8, at the top of the image. The "gyrational square" below it corresponds to the subgroup of four orientation-preserving symmetries of a square, using rotations but not reflections. The square is the most symmetrical of the ...

  7. Cyclic quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Cyclic_quadrilateral

    Other names for these quadrilaterals are concyclic quadrilateral and chordal quadrilateral, the latter since the sides of the quadrilateral are chords of the circumcircle. Usually the quadrilateral is assumed to be convex, but there are also crossed cyclic quadrilaterals. The formulas and properties given below are valid in the convex case.

  8. Euler's quadrilateral theorem - Wikipedia

    en.wikipedia.org/wiki/Euler's_quadrilateral_theorem

    Euler's quadrilateral theorem or Euler's law on quadrilaterals, named after Leonhard Euler (1707–1783), describes a relation between the sides of a convex quadrilateral and its diagonals. It is a generalisation of the parallelogram law which in turn can be seen as generalisation of the Pythagorean theorem .

  9. Algebraic geometry - Wikipedia

    en.wikipedia.org/wiki/Algebraic_geometry

    Algebraic geometry is a branch of mathematics which uses abstract algebraic techniques, mainly from commutative algebra, to solve geometrical problems.Classically, it studies zeros of multivariate polynomials; the modern approach generalizes this in a few different aspects.

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