protractor
A protractor is a ruler-like instrument used in geometry for measuring and constructing angles
A protractor is a ruler-like instrument used in geometry for measuring and constructing angles. Typically made of transparent plastic or metal, a protractor consists of a straight edge and a semi-circular or circular arc. The arc is divided into degrees, which are marked from 0 to 180 or from 0 to 360, depending on the type of protractor.
To measure an angle using a protractor, you align the center of the protractor with the vertex (common endpoint) of the angle. Then, you line up one side of the angle with the 0-degree mark on the protractor’s straight edge. Finally, you read the degree measurement where the other side of the angle intersects with the arc of the protractor.
Protractors are also used to construct angles of specific measurements. For example, to construct a 60-degree angle, you would place the center of the protractor at the desired vertex, align one side of the angle with the 0-degree mark, and then mark where the other side intersects with the arc at 60 degrees.
Protractors are an essential tool in geometry and are commonly used in various mathematical and engineering applications for measuring and drawing angles accurately. They come in different sizes and types, including half-circle (180 degrees) and full-circle (360 degrees) protractors.
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