What does a protractor look like?

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A protractor is a semicircular disk that is graduated in degrees 0° to 180°. It is mainly used to create and measure plane angles. It is an antique tool that was already in use during the 13th century.
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A protractor is a half circular instrument like a ruler, but instead of showing inches it shows the degrees of a circle, form 0 degrees to 180 degrees. You can find more information here: http://www.ossmann.com/protractor/
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