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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. Parallelogram - Wikipedia

    en.wikipedia.org/wiki/Parallelogram

    Two pairs of opposite sides are parallel (by definition). Two pairs of opposite sides are equal in length. Two pairs of opposite angles are equal in measure. The diagonals bisect each other. One pair of opposite sides is parallel and equal in length. Adjacent angles are supplementary. Each diagonal divides the quadrilateral into two congruent ...

  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. Space diagonal - Wikipedia

    en.wikipedia.org/wiki/Space_diagonal

    A magic square is an arrangement of numbers in a square grid so that the sum of the numbers along every row, column, and diagonal is the same. Similarly, one may define a magic cube to be an arrangement of numbers in a cubical grid so that the sum of the numbers on the four space diagonals must be the same as the sum of the numbers in each row, each column, and each pillar.

  6. Regular polygon - Wikipedia

    en.wikipedia.org/wiki/Regular_polygon

    The sum of the squared distances from the midpoints of the sides of a regular n-gon to any point on the circumcircle is 2nR 2 − ⁠ 1 / 4 ⁠ ns 2, where s is the side length and R is the circumradius.

  7. Quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Quadrilateral

    Isosceles trapezium (UK) or isosceles trapezoid (US): one pair of opposite sides are parallel and the base angles are equal in measure. Alternative definitions are a quadrilateral with an axis of symmetry bisecting one pair of opposite sides, or a trapezoid with diagonals of equal length. Parallelogram: a quadrilateral with two pairs of ...

  8. Kite (geometry) - Wikipedia

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

    The four sides can be split into two pairs of adjacent equal-length sides. [7] 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.

  9. Heptagon - Wikipedia

    en.wikipedia.org/wiki/Heptagon

    The impossibility of straightedge and compass construction follows from the observation that ⁡ is a zero of the irreducible cubic x 3 + x 2 − 2x − 1. Consequently, this polynomial is the minimal polynomial of 2cos( 2π ⁄ 7 ), whereas the degree of the minimal polynomial for a constructible number must be a power of 2.