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  2. Circle - Wikipedia

    en.wikipedia.org/wiki/Circle

    The tangent line through a point P on the circle is perpendicular to the diameter passing through P. If P = (x 1, y 1) and the circle has centre (a, b) and radius r, then the tangent line is perpendicular to the line from (a, b) to (x 1, y 1), so it has the form (x 1 − a)x + (y 1 – b)y = c.

  3. 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 ...

  4. Area of a circle - Wikipedia

    en.wikipedia.org/wiki/Area_of_a_circle

    Following Archimedes' argument in The Measurement of a Circle (c. 260 BCE), compare the area enclosed by a circle to a right triangle whose base has the length of the circle's circumference and whose height equals the circle's radius. If the area of the circle is not equal to that of the triangle, then it must be either greater or less.

  5. Nine-point circle - Wikipedia

    en.wikipedia.org/wiki/Nine-point_circle

    The nine-point circles are all congruent with a radius of half that of the cyclic quadrilateral's circumcircle. The nine-point circles form a set of four Johnson circles. Consequently, the four nine-point centers are cyclic and lie on a circle congruent to the four nine-point circles that is centered at the anticenter of the cyclic quadrilateral.

  6. Gauss circle problem - Wikipedia

    en.wikipedia.org/wiki/Gauss_circle_problem

    This problem is known as the primitive circle problem, as it involves searching for primitive solutions to the original circle problem. [9] It can be intuitively understood as the question of how many trees within a distance of r are visible in the Euclid's orchard , standing in the origin.

  7. Circumference - Wikipedia

    en.wikipedia.org/wiki/Circumference

    The use of the mathematical constant π is ubiquitous in mathematics, engineering, and science. In Measurement of a Circle written circa 250 BCE, Archimedes showed that this ratio (written as /, since he did not use the name π) was greater than 3 ⁠ 10 / 71 ⁠ but less than 3 ⁠ 1 / 7 ⁠ by calculating the perimeters of an inscribed and a ...

  8. Australian Open 2025: There really isn't much time off in the ...

    www.aol.com/australian-open-2025-really-isnt...

    If it seems as though the 2025 professional tennis year started pretty much immediately right after 2024 ended, that’s because that’s exactly what happens in a sport where the offseason really ...

  9. Mohr's circle - Wikipedia

    en.wikipedia.org/wiki/Mohr's_circle

    The diameter of the circle is the line joining point A and B. The centre of the circle is the intersection of this line with the σ n {\displaystyle \sigma _{\mathrm {n} }} -axis. Knowing both the location of the centre and length of the diameter, we are able to plot the Mohr circle for this particular state of stress.

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