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  2. 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 ...

  3. Paper size - Wikipedia

    en.wikipedia.org/wiki/Paper_size

    B4, B5, and B6 are used for envelopes that will hold C-series envelopes. B4 is quite common in printed music sheets. B5 is a relatively common choice for books. B7 is equal to the passport size ID-3 from ISO/IEC 7810. Many posters use B-series paper or a close approximation, such as 50 cm × 70 cm ~ B2.

  4. Mulready stationery - Wikipedia

    en.wikipedia.org/wiki/Mulready_stationery

    The one penny Mulready stationery. issued in 1840, hand coloured. Mulready stationery describes the postal stationery letter sheets and envelopes that were introduced as part of the British Post Office postal reforms of 1840. They went on sale on 1 May 1840, and were valid for use from 6 May. The Mulready name arises from the fact that William ...

  5. Envelope - Wikipedia

    en.wikipedia.org/wiki/Envelope

    An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a short-arm cross or a kite. These shapes allow the envelope structure to be made by folding the sheet sides ...

  6. Envelope (mathematics) - Wikipedia

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

    Envelope (mathematics) Construction of the envelope of a family of curves. In geometry, an envelope of a planar family of curves is a curve that is tangent to each member of the family at some point, and these points of tangency together form the whole envelope. Classically, a point on the envelope can be thought of as the intersection of two ...

  7. Back-of-the-envelope calculation - Wikipedia

    en.wikipedia.org/wiki/Back-of-the-envelope...

    Back-of-the-envelope calculation. A back-of-the-envelope calculation is a rough calculation, typically jotted down on any available scrap of paper such as an envelope. It is more than a guess but less than an accurate calculation or mathematical proof. The defining characteristic of back-of-the-envelope calculations is the use of simplified ...

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