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A 360 degrees protractor with graduations in degree: Date: 2 December 2007: Source: Personal work, based on a public domain licensed file, downloaded from Wikipedia (Image:Protractor.svg) Author: Georges Khaznadar <georgesk@ofset.org> Other versions
A protractor is a measuring instrument, typically made of transparent plastic, for measuring angles. Some protractors are simple half-discs or full circles. More advanced protractors, such as the bevel protractor, have one or two swinging arms, which can be used to help measure the angle. Most protractors measure angles in degrees (°).
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The FIRST image below shows ⊾ P = 20° on the protractor and ⊾ T = 20° on the angle Square. The only similarity is that both of the angles are acute angle and complimentary. When the image is enlarged the protractor is on the ⊾ 20° index and the body rests on the edged face of the 2X4.
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. Combining the two forms by placing the hypotenuses together will also yield 15° and 75° angles. They are often purchased in packs with protractors and compasses. Less commonly found is the adjustable set square.
Speed square, or rafter square, or rafter angle square, or triangle square, or layout square A speed square is a triangular carpenters square combining functions of the combination square, try square, and framing square into one. It can be used to calculate and mark angles, to suspend a plumb bob, and as a fence for a circular saw. [21] [22] [23]
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