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Folding doors are also known as 'bi-fold doors', in spite of them most often having more than two panels. Another term is ' concertina ' doors, inspired by the musical instrument of the same name. Folding doors can be used as internal or external room dividers and are made from a variety of materials.
Hiraki shoji are mounted on hinges in a doorframe, and open like a standard western door. Some are single doors, some double doors. [89] Double doors, whether bifold doors or not, are termed ryōbiraki shoji (両開障子). [90] Tsukuritsuke shoji (造付障子, "fixed shoji"), are often horizontal strips. [6]
DIN 18101/1985 defines interior single molded doors to have a common panel height of 1985 mm (normativ height 2010 mm) at panel widths of 610 mm, 735 mm, 860 mm, 985 mm, 1110 mm, plus a larger door panel size of 1110 mm x 2110 mm. [25] The newer DIN 18101/2014 drops the definition of just five standard door sizes in favor of a basic raster ...
exact dihedral angle (radians) dihedral angle – exact in bold, else approximate (degrees) Platonic solids (regular convex) Tetrahedron {3,3} (3.3.3)
In 3-dimensions it will be a zig-zag skew icositetragon and can be seen in the vertices and side edges of a dodecagonal antiprism with the same D 12d, [2 +,24] symmetry, order 48. The dodecagrammic antiprism, s{2,24/5} and dodecagrammic crossed-antiprism, s{2,24/7} also have regular skew dodecagons.
In 3-dimensions it will be a zig-zag skew decagon and can be seen in the vertices and side edges of a pentagonal antiprism, pentagrammic antiprism, and pentagrammic crossed-antiprism with the same D 5d, [2 +,10] symmetry, order 20. These can also be seen in these four convex polyhedra with icosahedral symmetry. The polygons on the perimeter of ...
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