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  2. Pattern Blocks - Wikipedia

    en.wikipedia.org/wiki/Pattern_blocks

    The second has a brown half-trapezoid and a pink half-triangle. Another set, Deci-Blocks, is made up of six shapes, equivalent to four, five, seven, eight, nine and ten triangles respectively. Christopher Danielson developed a new set of blocks, called Twenty-First Century Pattern Blocks . [ 8 ]

  3. Trapezoid - Wikipedia

    en.wikipedia.org/wiki/Trapezoid

    A right trapezoid (also called right-angled trapezoid) has two adjacent right angles. [13] Right trapezoids are used in the trapezoidal rule for estimating areas under a curve. An acute trapezoid has two adjacent acute angles on its longer base edge. An obtuse trapezoid on the other hand has one acute and one obtuse angle on each base.

  4. List of polygons, polyhedra and polytopes - Wikipedia

    en.wikipedia.org/wiki/List_of_polygons...

    Regular polyhedron. Platonic solid: . Tetrahedron, Cube, Octahedron, Dodecahedron, Icosahedron; Regular spherical polyhedron. Dihedron, Hosohedron; Kepler–Poinsot ...

  5. Garfield's proof of the Pythagorean theorem - Wikipedia

    en.wikipedia.org/wiki/Garfield's_proof_of_the...

    The proof appeared in print in the New-England Journal of Education (Vol. 3, No.14, April 1, 1876). ... is a trapezoid. The theorem is proved by computing the area of ...

  6. Vowel diagram - Wikipedia

    en.wikipedia.org/wiki/Vowel_diagram

    A vowel diagram or vowel chart is a schematic arrangement of the vowels.Depending on the particular language being discussed, it can take the form of a triangle or a quadrilateral.

  7. 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.

  8. File:Trapezium.svg - Wikipedia

    en.wikipedia.org/wiki/File:Trapezium.svg

    The following other wikis use this file: Usage on ar.wikipedia.org شبه منحرف; Usage on bn.wikipedia.org ট্রাপিজিয়াম

  9. Quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Quadrilateral

    Trapezia (UK) and trapezoids (US) include parallelograms. 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.

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