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Fold-and-cut theorem. Creating a Koch snowflake curve by the fold-and-cut method. The fold-and-cut theorem states that any shape with straight sides can be cut from a single (idealized) sheet of paper by folding it flat and making a single straight complete cut. [ 1 ] Such shapes include polygons, which may be concave, shapes with holes, and ...
Folding table. General use Folding Table. A folding table is a type of folding furniture, a table with legs that fold up against the table top. This is intended to make storage more convenient and to make the table more portable. Many folding tables are made of lightweight materials to further increase portability.
Mathematics of paper folding. Map folding for a 2×2 grid of squares: there are eight different ways to fold such a map along its creases. The discipline of origami or paper folding has received a considerable amount of mathematical study. Fields of interest include a given paper model's flat-foldability (whether the model can be flattened ...
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A folding chair of ebony and ivory with gold fittings was found in Tutankhamun's tomb in Egypt. Folding chairs were already used in the Nordic Bronze Age, Ancient Egypt, Minoan Greece and Ancient Rome. The frame was mostly made of wood, and seldom made of metal. The wood was inlaid with artistic carvings, gilded, and decorated with ivory.
Deckchair. A deckchair (or deck chair) is a folding chair, usually with a frame of treated wood or other material. The term now usually denotes a portable folding chair, with a single strip of fabric or vinyl forming the backrest and seat. It is meant for leisure, originally on the deck of an ocean liner or cruise ship.
A fishplate joins two lengths of track. A fishplate, splice bar or joint bar is a metal connecting plate used to bolt the ends of two rails into a continuous track. The name is derived from fish, [1] a wooden reinforcement of a "built-up" ship's mast that helped round out its desired profile. [2] The top and bottom faces taper inwards along ...
Sarcopterygii (/ ˌ s ɑːr k ɒ p t ə ˈ r ɪ dʒ i. aɪ /; from Ancient Greek σάρξ (sárx) 'flesh' and πτέρυξ (ptérux) 'wing, fin') — sometimes considered synonymous with Crossopterygii (from Ancient Greek κροσσός (krossós) 'fringe') — is a clade (traditionally a class or subclass) of vertebrate animals which includes a group of bony fish commonly referred to as lobe ...