Both types of protractors have a graduated circle and a pivoting arm.
There are two basic types: the circular and the semicircular.
You can also read a protractor by using its baseline, which is the side that has zero.Ī protractor is a simple tool used for calculating angles. The device has a number scale that goes from zero to 180 degrees, with one side of the angle lining up with 0 on its inner scale and a cosine scale on its outer scale.īy lining up these scales, you can measure angles accurately and get the right answer. What is a protractor?Ī protractor is a tool used in mathematics to calculate angles.
Here are some of the most common uses of a protractor. Before you start measuring things, you might be wondering: what is a protractor? What is its purpose? How do schools teach students to use a protractor?Īnd what can you measure with a protractor? This article will explain the basics.