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For every fraction โ p / q โ (in its lowest terms) there is a Ford circle C[โ p / q โ ], which is the circle with radius 1/(2q 2) and centre at (โ p / q โ , โ 1 / 2q 2 โ ). Two Ford circles for different fractions are either disjoint or they are tangent to one another—two Ford circles never intersect.
A compact binary circle packing with the most similarly sized circles possible. [7] It is also the densest possible packing of discs with this size ratio (ratio of 0.6375559772 with packing fraction (area density) of 0.910683). [8] There are also a range of problems which permit the sizes of the circles to be non-uniform.
Semicircle. πr 2 / 2 โ . In mathematics (and more specifically geometry), a semicircle is a one-dimensional locus of points that forms half of a circle. It is a circular arc that measures 180° (equivalently, π radians, or a half-turn). It only has one line of symmetry (reflection symmetry). In non-technical usage, the term "semicircle" is ...
In mathematics, a Ford circle is a circle in the Euclidean plane, in a family of circles that are all tangent to the -axis at rational points. For each rational number , expressed in lowest terms, there is a Ford circle whose center is at the point and whose radius is . It is tangent to the -axis at its bottom point, .
A simple fraction (also known as a common fraction or vulgar fraction, where vulgar is Latin for "common") is a rational number written as a / b or โ โ , where a and b are both integers. [9] As with other fractions, the denominator (b) cannot be zero. Examples include โ 1 2 โ , − โ 8 5 โ , โ −8 5 โ , and โ 8 −5 โ .
Mathematics is a field of study that discovers and organizes methods, theories and theorems that are developed and proved for the needs of empirical sciences and mathematics itself. There are many areas of mathematics, which include number theory (the study of numbers), algebra (the study of formulas and related structures), geometry (the study ...
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