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A semicircular tool is given in your geometry box (Drawing box). What is that called ? and why it is used ?

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There is a semicircular tool in a geometry box (Drawing box) called protractor.

It is used for measuring angles. Protractors measure angles in degrees whose symbol is. Whole protractor is in the form of semicircle from 0 to 180°, a straight line exactly in the middle at 90°. This is right angle.

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