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  2. Quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Quadrilateral

    Tangential quadrilateral: the four sides are tangents to an inscribed circle. A convex quadrilateral is tangential if and only if opposite sides have equal sums. Tangential trapezoid: a trapezoid where the four sides are tangents to an inscribed circle. Cyclic quadrilateral: the four vertices lie on a circumscribed circle. A convex ...

  3. Tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Tetrahedron

    In the case of a tetrahedron, the base is a triangle (any of the four faces can be considered the base), so a tetrahedron is also known as a "triangular pyramid". Like all convex polyhedra, a tetrahedron can be folded from a single sheet of paper. It has two such nets. [1]

  4. List of two-dimensional geometric shapes - Wikipedia

    en.wikipedia.org/wiki/List_of_two-dimensional...

    Quadrilateral – 4 sides Cyclic quadrilateral; Kite. Rectangle; Rhomboid; Rhombus; Square (regular quadrilateral) Tangential quadrilateral; Trapezoid. Isosceles trapezoid; Trapezus; Pentagon – 5 sides; Hexagon – 6 sides Lemoine hexagon; Heptagon – 7 sides; Octagon – 8 sides; Nonagon – 9 sides; Decagon – 10 sides; Hendecagon – 11 ...

  5. Square - Wikipedia

    en.wikipedia.org/wiki/Square

    A quadrilateral (a four-sided polygon in the Euclidean plane) is a square if and only if it is any one of the following: A rectangle with four equal sides [1] A rhombus with a right angle between a pair of adjacent sides [1] A rhombus with all angles equal [1] A parallelogram with one right angle and two adjacent equal sides [1]

  6. List of uniform polyhedra - Wikipedia

    en.wikipedia.org/wiki/List_of_uniform_polyhedra

    The 5 Platonic solids are called a tetrahedron, hexahedron, octahedron, dodecahedron and icosahedron with 4, 6, 8, 12, and 20 sides respectively. The regular hexahedron is a cube . Table of polyhedra

  7. Polyhedron - Wikipedia

    en.wikipedia.org/wiki/Polyhedron

    A topological polytope is a topological space given along with a specific decomposition into shapes that are topologically equivalent to convex polytopes and that are attached to each other in a regular way. Such a figure is called simplicial if each of its regions is a simplex, i.e. in an n-dimensional space each region has n+1 vertices

  8. Mathematicians Discovered a New 13-Sided Shape That Can ... - AOL

    www.aol.com/lifestyle/mathematicians-discovered...

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  9. List of mathematical shapes - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_shapes

    The elements of a polytope can be considered according to either their own dimensionality or how many dimensions "down" they are from the body.