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  2. Equivalent radius - Wikipedia

    en.wikipedia.org/wiki/Equivalent_radius

    US hat size is the circumference of the head, measured in inches, divided by pi, rounded to the nearest 1/8 inch. This corresponds to the 1D mean diameter. [1] Diameter at breast height is the circumference of tree trunk, measured at height of 4.5 feet, divided by pi. This corresponds to the 1D mean diameter.

  3. Mohr's circle - Wikipedia

    en.wikipedia.org/wiki/Mohr's_circle

    Draw the diameter of the circle by joining points and with a straight line ¯. Draw the Mohr Circle . The centre O {\displaystyle O} of the circle is the midpoint of the diameter line A B ¯ {\displaystyle {\overline {AB}}} , which corresponds to the intersection of this line with the σ n {\displaystyle \sigma _{\mathrm {n} }} axis.

  4. Chord (geometry) - Wikipedia

    en.wikipedia.org/wiki/Chord_(geometry)

    In the 2nd century AD, Ptolemy compiled a more extensive table of chords in his book on astronomy, giving the value of the chord for angles ranging from ⁠ 1 / 2 ⁠ to 180 degrees by increments of ⁠ 1 / 2 ⁠ degree. Ptolemy used a circle of diameter 120, and gave chord lengths accurate to two sexagesimal (base sixty) digits after the ...

  5. Roundness - Wikipedia

    en.wikipedia.org/wiki/Roundness

    Roundness = ⁠ Perimeter 2 / 4 π × Area ⁠. This ratio will be 1 for a circle and greater than 1 for non-circular shapes. Another definition is the inverse of that: Roundness = ⁠ 4 π × Area / Perimeter 2 ⁠, which is 1 for a perfect circle and goes down as far as 0 for highly non-circular shapes.

  6. Lincoln Public Schools - Wikipedia

    en.wikipedia.org/wiki/Lincoln_Public_Schools

    The top two first-language groups, as of 2018–19 school year, are Arabic and Kurdish speakers (38.4%), and Spanish speakers (25.2%). From the 2010–11 to the 2018–19 school years, LPS saw Arabic and Kurdish ELL students increase by over 196%, from 321 Arabic and 63 Kurdish speaking students to 605 Arabic and 532 Kurdish speaking students.

  7. Archimedean circle - Wikipedia

    en.wikipedia.org/wiki/Archimedean_circle

    In geometry, an Archimedean circle is any circle constructed from an arbelos that has the same radius as each of Archimedes' twin circles. If the arbelos is normed such that the diameter of its outer (largest) half circle has a length of 1 and r denotes the radius of any of the inner half circles, then the radius ρ of such an Archimedean ...

  8. Launch Processing System - Wikipedia

    en.wikipedia.org/wiki/Launch_Processing_System

    The LPS was designed to oversee and manage the parallel processing of multiple orbiters and their subsystems in order to meet this launch schedule. [1] The LPS tracks and manages all components of the Space Shuttle launch vehicle from the time the individual components arrive at KSC, through checkout, integration, testing, installation, and ...

  9. Gauss circle problem - Wikipedia

    en.wikipedia.org/wiki/Gauss_circle_problem

    Gauss's circle problem asks how many points there are inside this circle of the form (,) where and are both integers. Since the equation of this circle is given in Cartesian coordinates by x 2 + y 2 = r 2 {\displaystyle x^{2}+y^{2}=r^{2}} , the question is equivalently asking how many pairs of integers m and n there are such that