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2. Paper size - Wikipedia

   en.wikipedia.org/wiki/Paper_size

   A foot-long sheet with the common width of Letter and (Government) Legal, i.e. 81⁄2 in × 12 in (215 mm × 305 mm), would have an aspect ratio very close to the square root of two as used by international paper sizes and would actually almost exactly match ISO RA4 (215 mm × 305 mm).

3. Book size - Wikipedia

   en.wikipedia.org/wiki/Book_size

   Traditional book sizes/formats used in English-speaking countries. Based on the 19-by-24-inch or 482.5-by-609.5-millimetre printing paper size, which equals two folio leaves, four quarto leaves, eight octavo leaves, etc. For comparison, common American letter size is shown in green. Books made by printing two pages of text on each side of a ...

4. Ratio - Wikipedia

   en.wikipedia.org/wiki/Ratio

   Ratio. In mathematics, a ratio (/ ˈreɪʃ (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). Similarly, the ratio of lemons to oranges is 6:8 (or 3:4) and ...

5. List of pitch intervals - Wikipedia

   en.wikipedia.org/wiki/List_of_pitch_intervals

   The extremes of the meantone systems encountered in historical practice are the Pythagorean tuning, where the whole tone corresponds to 9:8, i.e. ⁠ (3:2) 2 / 2 ⁠, the mean of the major third ⁠ (3:2) 4 / 4 ⁠, and the fifth (3:2) is not tempered; and the 1 ⁄ 3-comma meantone, where the fifth is tempered to the extent that three ...

6. Just intonation - Wikipedia

   en.wikipedia.org/wiki/Just_intonation

   Harmonic series, partials 1–5 numbered. In music, just intonation or pure intonation is the tuning of musical intervals as whole number ratios (such as 3:2 or 4:3) of frequencies. An interval tuned in this way is said to be pure, and is called a just interval. Just intervals (and chords created by combining them) consist of tones from a ...

7. Photo print sizes - Wikipedia

   en.wikipedia.org/wiki/Photo_print_sizes

   The alternative Super series, denoted SnR, nR Plus or nR+, has an aspect ratio of 3∶2 (or as close as possible) and thus provides a better fit for standard 135 film (35 mm) at sizes of 8 inches or above. 5R is twice the size of a 2R print, 6R twice the size of a 4R print and S8R twice the size of 6R. 4D/6D is a newer size for most consumer ...