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  2. Hexagon - Wikipedia

    en.wikipedia.org/wiki/Hexagon

    A principal diagonal of a hexagon is a diagonal which divides the hexagon into quadrilaterals. In any convex equilateral hexagon (one with all sides equal) with common side a, there exists [11]: p.184, #286.3 a principal diagonal d 1 such that and a principal diagonal d 2 such that

  3. Regular polygon - Wikipedia

    en.wikipedia.org/wiki/Regular_polygon

    A non-convex regular polygon is a regular star polygon. The most common example is the pentagram, which has the same vertices as a pentagon, but connects alternating vertices. For an n-sided star polygon, the Schläfli symbol is modified to indicate the density or "starriness" m of the polygon, as {n/m}.

  4. Diagonal - Wikipedia

    en.wikipedia.org/wiki/Diagonal

    The diagonals of a cube with side length 1. AC' (shown in blue) is a space diagonal with length , while AC (shown in red) is a face diagonal and has length .. In geometry, a diagonal is a line segment joining two vertices of a polygon or polyhedron, when those vertices are not on the same edge.

  5. Tangential quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Tangential_quadrilateral

    The two diagonals and the two tangency chords are concurrent. [11] [10]: p.11 One way to see this is as a limiting case of Brianchon's theorem, which states that a hexagon all of whose sides are tangent to a single conic section has three diagonals that meet at a point. From a tangential quadrilateral, one can form a hexagon with two 180 ...

  6. Equilateral polygon - Wikipedia

    en.wikipedia.org/wiki/Equilateral_polygon

    The principal diagonals of a hexagon each divide the hexagon into quadrilaterals. In any convex equilateral hexagon with common side a , there exists a principal diagonal d 1 such that [ 3 ] d 1 a ≤ 2 {\displaystyle {\frac {d_{1}}{a}}\leq 2}

  7. Kite (geometry) - Wikipedia

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

    One diagonal crosses the midpoint of the other diagonal at a right angle, forming its perpendicular bisector. [9] (In the concave case, the line through one of the diagonals bisects the other.) One diagonal is a line of symmetry. It divides the quadrilateral into two congruent triangles that are mirror images of each other. [7]

  8. Hexadecagon - Wikipedia

    en.wikipedia.org/wiki/Hexadecagon

    The dihedral symmetries are divided depending on whether they pass through vertices (d for diagonal) or edges ... A hexadecagram is a 16-sided star polygon, ...

  9. Quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Quadrilateral

    The diagonals of the Varignon parallelogram are the bimedians of the original quadrilateral. The two bimedians in a quadrilateral and the line segment joining the midpoints of the diagonals in that quadrilateral are concurrent and are all bisected by their point of intersection. [24]: p.125