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  2. 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. Vertical position on the diagram denotes the vowel closeness, with close vowels at the top of the diagram, and horizontal position denotes the vowel backness, with ...

  3. Ames window - Wikipedia

    en.wikipedia.org/wiki/Ames_window

    Ames window. The Ames trapezoid or Ames window is an image on, for example, a flat piece of cardboard that seems to be a rectangular window but is, in fact, a trapezoid. Both sides of the piece of cardboard have the same image. The cardboard is hung vertically from a wire so it can rotate around continuously, or is attached to a vertical ...

  4. File:Blank vowel trapezoid-three-height.svg - Wikipedia

    en.wikipedia.org/wiki/File:Blank_vowel_trapezoid...

    File:Blank vowel trapezoid-three-height.svg. Size of this PNG preview of this SVG file: 800 × 560 pixels. Other resolutions: 320 × 224 pixels | 640 × 448 pixels | 1,024 × 717 pixels | 1,280 × 896 pixels | 2,560 × 1,792 pixels | 1,000 × 700 pixels. This is a file from the Wikimedia Commons. Information from its description page there is ...

  5. File:Blank vowel trapezoid.svg - Wikipedia

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

    This image is a derivative work of the following images: File:Blank_vowel_trapezoid.png licensed with GFDL. 2005-07-19T06:08:33Z Denelson83 1000x700 (5700 Bytes) More accurate version - Overcoming a perceived optical illusion. 2005-07-19T00:47:27Z Denelson83 1000x700 (5296 Bytes) Thinner lines. 2005-07-18T02:31:12Z Denelson83 1000x700 (5290 ...

  6. Ames room - Wikipedia

    en.wikipedia.org/wiki/Ames_room

    Ames room. Photograph of two adults standing in an Ames room, apparently with a significant difference in size. An Ames room is a distorted room that creates an optical illusion. Likely influenced by the writings of Hermann Helmholtz, [1] it was invented by American scientist Adelbert Ames Jr. in 1946, [2] and constructed in the following year.

  7. Trapezoid - Wikipedia

    en.wikipedia.org/wiki/Trapezoid

    Look up trapezoid in Wiktionary, the free dictionary. In geometry, a trapezoid (/ ˈtræpəzɔɪd /) in North American English, or trapezium (/ trəˈpiːziəm /) in British English, [1][2] is a quadrilateral that has one pair of parallel sides. The parallel sides are called the bases of the trapezoid. The other two sides are called the legs ...

  8. Pattern Blocks - Wikipedia

    en.wikipedia.org/wiki/Pattern_blocks

    Pattern Blocks. Pattern Blocks are a set of mathematical manipulatives developed in the 1960s. The six shapes are both a play resource and a tool for learning in mathematics, which serve to develop spatial reasoning skills that are fundamental to the learning of mathematics. Among other things, they allow children to see how shapes can be ...

  9. Isosceles trapezoid - Wikipedia

    en.wikipedia.org/wiki/Isosceles_trapezoid

    Dual polygon. Kite. In Euclidean geometry, an isosceles trapezoid (isosceles trapezium in British English) is a convex quadrilateral with a line of symmetry bisecting one pair of opposite sides. It is a special case of a trapezoid. Alternatively, it can be defined as a trapezoid in which both legs and both base angles are of equal measure, [1 ...

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