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2. Unit circle - Wikipedia

   en.wikipedia.org/wiki/Unit_circle

   Since C = 2πr, the circumference of a unit circle is 2π. In mathematics, a unit circle is a circle of unit radius—that is, a radius of 1. [1] Frequently, especially in trigonometry, the unit circle is the circle of radius 1 centered at the origin (0, 0) in the Cartesian coordinate system in the Euclidean plane.

3. Circle packing in a circle - Wikipedia

   en.wikipedia.org/wiki/Circle_packing_in_a_circle

   Download as PDF; Printable version; ... Circle packing in a circle is a two-dimensional packing problem with the objective of ... Enclosing circle radius

4. 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.

5. Perimeter - Wikipedia

   en.wikipedia.org/wiki/Perimeter

   Download as PDF; Printable version; ... is the radius of the circle and is the ... If the diameter of a circle is 1, ...

6. Circumference - Wikipedia

   en.wikipedia.org/wiki/Circumference

   The circumference of a circle is the distance around it, but if, as in many elementary treatments, distance is defined in terms of straight lines, this cannot be used as a definition. Under these circumstances, the circumference of a circle may be defined as the limit of the perimeters of inscribed regular polygons as the number of sides ...

7. Geometric mean - Wikipedia

   en.wikipedia.org/wiki/Geometric_mean

   The radius of the circle is the geometric mean of the semi-major and the semi-minor axes of the ellipse formed by deforming the circle. Distance to the horizon of a sphere (ignoring the effect of atmospheric refraction when atmosphere is present) is equal to the geometric mean of the distance to the closest point of the sphere and the distance ...