Portable Measuring Tool Vernier Universal Bevel Protractor

First of all, we need to draw the vertex and side of the angle, which coincides with the time of measuring the angle. The vertex and side can be drawn at will, and their position does not affect the degree of the final angle. After completion, we need to make the vertex of the angle coincide with the center of the protractor, and the side coincides with the zero scale line.