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  2. Standard ruler - Wikipedia

    en.wikipedia.org/wiki/Standard_ruler

    A standard ruler is an astronomical object for which the actual physical size is known. By measuring its angular size in the sky, one can use simple trigonometry to determine its distance from Earth.

  3. Ruler - Wikipedia

    en.wikipedia.org/wiki/Ruler

    A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]

  4. Tape measure - Wikipedia

    en.wikipedia.org/wiki/Tape_measure

    Tape measures are often designed for specific uses or trades. Tapes may have different scales, be made of different materials, and be of different lengths depending on the intended use.

  5. Guinean units of measurement - Wikipedia

    en.wikipedia.org/wiki/Guinean_units_of_measurement

    One benda was equal to 0.0642 kg. [1] [2] One kantar was equal to 0.977 kg. [1] [2] One gammell was 1/5 kantar. [1] [2] Some other units are given below: [1] [2] 1 akey = 1 ⁄ 48 benda 1 mediatabla = 1 ⁄ 32 benda 1 aguirage = 1 ⁄ 16 benda 1 quinto = 3 ⁄ 32 benda 1 piso = 1 uzan = 1 ⁄ 8 benda 1 seron = 3 ⁄ 16 benda 1 eggaba = 1 ⁄ 3 ...

  6. Parallel rulers - Wikipedia

    en.wikipedia.org/wiki/Parallel_rulers

    Parallel rule in plastic with aluminum arms lying on a cutting mat. Parallel rulers are a drafting instrument used by navigators to draw parallel lines on charts. The tool consists of two straight edges joined by two arms which allow them to move closer or further away while always remaining parallel to each other.

  7. Pythagorean theorem - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_theorem

    In mathematics, the Pythagorean theorem or Pythagoras' theorem is a fundamental relation in Euclidean geometry between the three sides of a right triangle.It states that the area of the square whose side is the hypotenuse (the side opposite the right angle) is equal to the sum of the areas of the squares on the other two sides.

  8. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159.The number π appears in many formulae across mathematics and physics.

  9. Flexural strength - Wikipedia

    en.wikipedia.org/wiki/Flexural_strength

    The flexural strength is stress at failure in bending. It is equal to or slightly larger than the failure stress in tension. Flexural strength, also known as modulus of rupture, or bend strength, or transverse rupture strength is a material property, defined as the stress in a material just before it yields in a flexure test. [1]