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An unassembled IKEA flat-pack stool. Ready-to-assemble furniture (RTA), also known as knock-down furniture (KD), flat-pack furniture, or kit furniture, is a form of furniture that requires customer assembly. The separate components are packed for sale in cartons which also contain assembly instructions and sometimes hardware.
IKEA (/ aɪ ˈ k iː ə / eye-KEE-ə, Swedish:), is a multinational conglomerate founded in Sweden [6] [7] that designs and sells ready-to-assemble furniture, household goods, and various related services.
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]
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.