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  2. Bisection - Wikipedia

    en.wikipedia.org/wiki/Bisection

    The 'exterior' or 'external bisector' is the line that divides the supplementary angle (of 180° minus the original angle), formed by one side forming the original angle and the extension of the other side, into two equal angles. [1] To bisect an angle with straightedge and compass, one draws a circle whose center is the vertex. The circle ...

  3. Sagittal plane - Wikipedia

    en.wikipedia.org/wiki/Sagittal_plane

    The sagittal plane (/ ˈ s æ dʒ ɪ t əl /; also known as the longitudinal plane) is an anatomical plane that divides the body into right and left sections. [1] It is perpendicular to the transverse and coronal planes.

  4. Median (geometry) - Wikipedia

    en.wikipedia.org/wiki/Median_(geometry)

    Each median divides the area of the triangle in half, hence the name, and hence a triangular object of uniform density would balance on any median. (Any other lines that divide triangle's area into two equal parts do not pass through the centroid.) [2] [3] The three medians divide the triangle into six smaller triangles of equal area.

  5. Rule of thirds - Wikipedia

    en.wikipedia.org/wiki/Rule_of_thirds

    The guideline proposes that an image should be imagined as divided into nine equal parts by two equally spaced horizontal lines and two equally spaced vertical lines, and that important compositional elements should be placed along these lines or their intersections. [4]

  6. Intersecting chords theorem - Wikipedia

    en.wikipedia.org/wiki/Intersecting_chords_theorem

    In Euclidean geometry, the intersecting chords theorem, or just the chord theorem, is a statement that describes a relation of the four line segments created by two intersecting chords within a circle. It states that the products of the lengths of the line segments on each chord are equal.

  7. Angle trisection - Wikipedia

    en.wikipedia.org/wiki/Angle_trisection

    Bisection of arbitrary angles has long been solved.. Using only an unmarked straightedge and a compass, Greek mathematicians found means to divide a line into an arbitrary set of equal segments, to draw parallel lines, to bisect angles, to construct many polygons, and to construct squares of equal or twice the area of a given polygon.

  8. Polyptych - Wikipedia

    en.wikipedia.org/wiki/Polyptych

    A polyptych (/ ˈ p ɒ l ɪ p t ɪ k / POL-ip-tik; Greek: poly-"many" and ptychē "fold") is a work of art (usually a panel painting) which is divided into sections, or panels. Some definitions restrict "polyptych" to works with more than three sections: [ 1 ] a diptych is a two-part work of art; a triptych is a three-part work; a tetraptych or ...

  9. Division of the field - Wikipedia

    en.wikipedia.org/wiki/Division_of_the_field

    Shields may be divided this way for differencing (to avoid conflict with otherwise similar coats of arms) or for purposes of marshalling (combining two or more coats of arms into one), or simply for style. The lines that divide a shield may not always be straight, and there is a system of terminology for describing patterned lines, which is ...