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The ratio of width to height of standard-definition television. In mathematics, a ratio (/ ˈ r eɪ ʃ (i) oʊ /) shows how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3).
Similarity (geometry) In Euclidean geometry, two objects are similar if they have the same shape, or if one has the same shape as the mirror image of the other. More precisely, one can be obtained from the other by uniformly scaling (enlarging or reducing), possibly with additional translation, rotation and reflection.
The golden ratio is also an algebraic number and even an algebraic integer. It has minimal polynomial. This quadratic polynomial has two roots, and. The golden ratio is also closely related to the polynomial. which has roots and As the root of a quadratic polynomial, the golden ratio is a constructible number.
Proportion (mathematics) A proportion is a mathematical statement expressing equality of two ratios. [ 1][ 2] a and d are called extremes, b and c are called means . Proportion can be written as , where ratios are expressed as fractions . Such a proportion is known as geometrical proportion, [ 3] not to be confused with arithmetical proportion ...
For one gets a point reflection at point. Homothety of a pyramid. In mathematics, a homothety (or homothecy, or homogeneous dilation) is a transformation of an affine space determined by a point S called its center and a nonzero number called its ratio, which sends point to a point by the rule [ 1] for a fixed number . Using position vectors: .
Aspect ratio. The aspect ratio of a geometric shape is the ratio of its sizes in different dimensions. For example, the aspect ratio of a rectangle is the ratio of its longer side to its shorter side—the ratio of width to height, [ 1][ 2] when the rectangle is oriented as a "landscape". The aspect ratio is most often expressed as two integer ...
Golden triangle (mathematics) A golden triangle. The ratio a/b is the golden ratio φ. The vertex angle is . Base angles are 72° each. Golden gnomon, having side lengths 1, 1, and. A golden triangle, also called a sublime triangle, [ 1] is an isosceles triangle in which the duplicated side is in the golden ratio to the base side:
The point D is the harmonic conjugate of C with respect to A and B precisely if the cross-ratio of the quadruple is −1, called the harmonic ratio. The cross-ratio can therefore be regarded as measuring the quadruple's deviation from this ratio; hence the name anharmonic ratio. The cross-ratio is preserved by linear fractional transformations.
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