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  2. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The apparent triangles formed from the figures are 13 units wide and 5 units tall, so it appears that the area should be S = ⁠ 13×5 / 2 ⁠ = 32.5 units. However, the blue triangle has a ratio of 5:2 (=2.5), while the red triangle has the ratio 8:3 (≈2.667), so the apparent combined hypotenuse in each figure is actually bent.

  3. Triangle - Wikipedia

    en.wikipedia.org/wiki/Triangle

    Triangles have many types based on the length of the sides and the angles. A triangle whose sides are all the same length is an equilateral triangle, [3] a triangle with two sides having the same length is an isosceles triangle, [4] [a] and a triangle with three different-length sides is a scalene triangle. [7]

  4. Plus and minus signs - Wikipedia

    en.wikipedia.org/wiki/Plus_and_minus_signs

    u+2a28 ⨨ plus sign with black triangle; u+2a29 ⨩ minus sign with comma above; u+2a2a ⨪ minus sign with dot below; u+2a2b ⨫ minus sign with falling dots; u+2a2c ⨬ minus sign with rising dots; u+2a2d ⨭ plus sign in left half circle; u+2a2e ⨮ plus sign in right half circle; u+2795 heavy plus sign; u+2796 heavy minus sign

  5. File:Ohm's law triangle.svg - Wikipedia

    en.wikipedia.org/wiki/File:Ohm's_law_triangle.svg

    Getting U in the center of the triangle. Displays correctly in Inkscape, but takes some adjustments for wikimedia commons. 10:37, 14 July 2015: 400 × 305 (4 KB) Silver V. Changed colors to black and white, added fallback fonts, changed tspan text-anchor to middle in order to display correctly. 10:26, 14 July 2015: 400 × 305 (2 KB) Silver V.

  6. Tangram - Wikipedia

    en.wikipedia.org/wiki/Tangram

    The origin of the English word 'tangram' is unclear. One conjecture holds that it is a compound of the Greek element '-gram' derived from γράμμα ('written character, letter, that which is drawn') with the 'tan-' element being variously conjectured to be Chinese t'an 'to extend' or Cantonese t'ang 'Chinese'. [5]

  7. File:Basic physics formula triangles.svg - Wikipedia

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

    basic physics formula triangles: Image title: Image mnemonics in the style of the Ohm's law formula triangle for high-school physics by CMG Lee. Covering the unknown in each mnemonic gives the formula in terms of the remaining parameters. In the SVG file, hover over a symbol for its meaning and formula. Width: 100%: Height: 100%

  8. Special right triangle - Wikipedia

    en.wikipedia.org/wiki/Special_right_triangle

    Set square shaped as 45° - 45° - 90° triangle The side lengths of a 45° - 45° - 90° triangle 45° - 45° - 90° right triangle of hypotenuse length 1.. In plane geometry, dividing a square along its diagonal results in two isosceles right triangles, each with one right angle (90°, ⁠ π / 2 ⁠ radians) and two other congruent angles each measuring half of a right angle (45°, or ...

  9. Triangular tiling - Wikipedia

    en.wikipedia.org/wiki/Triangular_tiling

    Because the internal angle of the equilateral triangle is 60 degrees, six triangles at a point occupy a full 360 degrees. The triangular tiling has Schläfli symbol of {3,6}. English mathematician John Conway called it a deltille , named from the triangular shape of the Greek letter delta (Δ).

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