Factory Selling 0-180 Degree Angle Ruler 90X150mm Angle Finder Goniometer

When measuring the angle, first put the protractor on the top of the angle, then find the vertex of the angle, make the center of the protractor coincide with the vertex of the angle, and then make the side of the angle coincide with the zero scale line. After completing the two coincidences, we can measure the degree of the angle. Find the other side of the angle and see which scale of the protractor the other side of the angle falls on. At this time, the angle degree is how much.

A protractor is an instrument used to measure the degree of an angle, which is generally semi-circular. The diameter of the semicircle is the zero scale line of the protractor, and the center of the diameter is the center of the protractor. The scale on the semicircle is the degree used to measure the angle, ranging from 0 to 180 degrees.