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  2. Sofa bed - Wikipedia

    en.wikipedia.org/wiki/Sofa_bed

    Although most sofa beds use a queen short mattress measuring 150 cm × 185 cm (60 in × 72 in), other common sizes include 145 cm × 185 cm (58 in × 72 in), 135 cm × 185 cm (54 in × 72 in), and 130 cm × 185 cm (52 in × 72 in). The average sofa bed mattress thickness is 11 cm (4.5 in).

  3. Couch - Wikipedia

    en.wikipedia.org/wiki/Couch

    A couch, also known as a sofa, settee, chesterfield, or davenport, is a cushioned item of furniture that can seat multiple people. It is commonly found in the form of a bench with upholstered armrests and is often fitted with springs and tailored cushion and pillows. [1] [2] Although a couch is used primarily for seating, it may be used for ...

  4. IKEA Klippan - Wikipedia

    en.wikipedia.org/wiki/IKEA_Klippan

    Adjustments to the materials used in the sofa and the centralization of production methods allowed IKEA to reduce the price of the Klippan sofa by 40% since 1980. [4] In 2003, the Klippan was used as the standard sofa in a test to compare the British fire safety requirements against the Swedish and mainland European safety requirements.

  5. Moving sofa problem - Wikipedia

    en.wikipedia.org/wiki/Moving_sofa_problem

    The area thus obtained is referred to as the sofa constant. The exact value of the sofa constant is an open problem. The leading solution, by Joseph L. Gerver, has a value of approximately 2.2195. In November 2024, Jineon Baek posted an arXiv preprint claiming that Gerver's value is optimal, which if true, would solve the moving sofa problem. [2]

  6. Preferred number - Wikipedia

    en.wikipedia.org/wiki/Preferred_number

    Standard metric paper sizes use the square root of two (√ 2) as factors between neighbouring dimensions rounded to the nearest mm (Lichtenberg series, ISO 216). An A4 sheet for example has an aspect ratio very close to √ 2 and an area very close to 1/16 square metre. An A5 is almost exactly half an A4, and has the same aspect ratio.

  7. Marshmallow sofa - Wikipedia

    en.wikipedia.org/wiki/Marshmallow_sofa

    Marshmallow Love Seat #5670, [1] commonly known as the Marshmallow sofa, is a modernist sofa produced by the American furniture company Herman Miller, that was initially manufactured between 1956 and 1961. It is considered the most iconic of all modernist sofas. [2] The sofa was designed by Irving Harper of George Nelson Associates.

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