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2. Square root of 5 - Wikipedia

   en.wikipedia.org/wiki/Square_root_of_5

   The diagonal of a half square forms the basis for the geometrical construction of a golden rectangle.. The golden ratio φ is the arithmetic mean of 1 and . [4] The algebraic relationship between , the golden ratio and the conjugate of the golden ratio (Φ = − ⁠ 1 / φ ⁠ = 1 − φ) is expressed in the following formulae:

3. Ratio - Wikipedia

   en.wikipedia.org/wiki/Ratio

   For example, the ratio 4:5 can be written as 1:1.25 (dividing both sides by 4) Alternatively, it can be written as 0.8:1 (dividing both sides by 5). Where the context makes the meaning clear, a ratio in this form is sometimes written without the 1 and the ratio symbol (:), though, mathematically, this makes it a factor or multiplier .

4. Proportionality (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Proportionality_(mathematics)

   In mathematics, two sequences of numbers, often experimental data, are proportional or directly proportional if their corresponding elements have a constant ratio. The ratio is called coefficient of proportionality (or proportionality constant) and its reciprocal is known as constant of normalization (or normalizing constant).

5. Ratio test - Wikipedia

   en.wikipedia.org/wiki/Ratio_test

   In this example, the ratio of adjacent terms in the blue sequence converges to L=1/2. We choose r = (L+1)/2 = 3/4. Then the blue sequence is dominated by the red sequence r k for all n ≥ 2. The red sequence converges, so the blue sequence does as well. Below is a proof of the validity of the generalized ratio test.

6. 1:5:200 - Wikipedia

   en.wikipedia.org/wiki/1:5:200

   In a paper "Re-examining the costs and value ratios of owning and occupying buildings", Graham Ive [7] notes how widely the 1:5:200 ratio has been cited among policy makers and practitioners, and goes on to use published data about whole-life economic costs and the total costs of occupancy to re-assess the ratios. The paper finds that 1:5:200 ...

7. Aspect ratio - Wikipedia

   en.wikipedia.org/wiki/Aspect_ratio

   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 numbers separated by a colon (x:y), less commonly as a simple or decimal fraction. The values x and y do ...