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  2. Aspect ratio (image) - Wikipedia

    en.wikipedia.org/wiki/Aspect_ratio_(image)

    Aspect ratio (image) The aspect ratio of an image is the ratio of its width to its height. It is expressed as two numbers separated by a colon, width:height. Common aspect ratios are 1.85:1 and 2.40:1 in cinematography, 4:3 and 16:9 in television, and 3:2 in still photography.

  3. Special right triangle - Wikipedia

    en.wikipedia.org/wiki/Special_right_triangle

    A special right triangle is a right triangle with some regular feature that makes calculations on the triangle easier, or for which simple formulas exist. For example, a right triangle may have angles that form simple relationships, such as 45°–45°–90°. This is called an "angle-based" right triangle. A "side-based" right triangle is one ...

  4. Aspect ratio - Wikipedia

    en.wikipedia.org/wiki/Aspect_ratio

    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 not represent actual widths and heights but, rather, the proportion between width and height. As an example, 8:5, 16:10, 1.6:1, 5 and 1.6 are all ways of representing the same aspect ratio.

  5. Display aspect ratio - Wikipedia

    en.wikipedia.org/wiki/Display_aspect_ratio

    The display aspect ratio (DAR) is the aspect ratio of a display device and so the proportional relationship between the physical width and the height of the display. It is expressed as two numbers separated by a colon (x: y), where x corresponds to the width and y to the height. Common aspect ratios for displays, past and present, include 5:4 ...

  6. Paper size - Wikipedia

    en.wikipedia.org/wiki/Paper_size

    9+3⁄4 × 13+3⁄4. 7∶5. The most common paper sizes used for commercial and industrial printing in Colombia are based upon a size referred to as pliego that is ISO B1 (707 mm × 1000 mm) cut to full decimetres. Smaller sizes are derived by halving as usual and just get a vulgar fraction prefix: 1⁄2 pliego and 1⁄4 pliego.

  7. JPEG - Wikipedia

    en.wikipedia.org/wiki/JPEG

    The ratios at which the downsampling is ordinarily done for JPEG images are 4:4:4 (no downsampling), 4:2:2 (reduction by a factor of 2 in the horizontal direction), or (most commonly) 4:2:0 (reduction by a factor of 2 in both the horizontal and vertical directions). For the rest of the compression process, Y', Cb and Cr are processed separately ...

  8. Superparticular ratio - Wikipedia

    en.wikipedia.org/wiki/Superparticular_ratio

    Just diatonic semitone on C: ⁠ 16 15 ⁠ = ⁠ 15 + 1 15 ⁠ = 1 + ⁠ 1 15 ⁠ Play ⓘ. In mathematics, a superparticular ratio, also called a superparticular number or epimoric ratio, is the ratio of two consecutive integer numbers. More particularly, the ratio takes the form: where n is a positive integer. Thus:

  9. Space elevator - Wikipedia

    en.wikipedia.org/wiki/Space_elevator

    Download as PDF; Printable version; In other projects ... [4] [5] [6] Decades later, in ... Using the above formula, the ratio between the cross-section at ...