![]() ![]() Variants in larger sizes, with fixed or detachable handles, with or without bevelled edges (facets), and with or without ink nodules or embossed labels exist as well. ![]() The original design has a hypotenuse length of 15.8 cm and features a 2×7 cm symmetry scale in millimeter and degree raster. Relatively uncommon in English-speaking countries, this is sometimes called a "protractor triangle", a term, however, also used for other similar designs. It was originally developed in 1964 by the German-Austrian manufacturer Dennert & Pape Aristo-Werke (after several refirmations now Geotec Schul- und Bürowaren GmbH). Being a mandatory tool used by pupils in middle school and higher in German-speaking and neighbouring countries, this specific design is named " Geodreieck " (short form of " Geometrie-Dreieck", meaning "geometry triangle") or similar. In some European countries a common form of set square combines a 90-45-45 triangle, a ruler and a protractor into a single tool made of stiff or slightly flexible transparent plastic. Variant of larger TZ-Dreieck with extra markings Adjustment to the marked angle will produce any desired angle up to a maximum of 180°. Here, the body of the object is cut in half and rejoined with a hinge marked with angles. Less commonly found is the adjustable set square. They are often purchased in packs with protractors and compasses. Combining the two forms by placing the hypotenuses together will also yield 15° and 75° angles. These set squares come in two usual forms, both right triangles: one with 90-45-45 degree angles, the other with 30-60-90 degree angles. More commonly the set square bears the markings of a ruler and a half circle protractor. The simplest form of set square is a triangular piece of transparent plastic (or formerly of polished wood) with the centre removed. A set square or triangle ( American English) is an object used in engineering and technical drawing, with the aim of providing a straightedge at a right angle or other particular planar angle to a baseline. ![]()
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