Question 7 of 10 When using a protractor, it is important to make sure the mark stays the vertex of the angle. A. side B. scale C. vertex D. center

The vertex of an angle is the point where the two sides of the angle meet, just like the pivot point on a see-saw. If you don't align the protractor's center hole with the vertex, you could end up measuring the angle incorrectly, much like trying to guess the length of a bridge from the wrong standpoint! While using a protractor, a common mistake is forgetting to check that the protractor's baseline is aligned with one side of the angle. If you place the protractor incorrectly, even slightly, your angle measurement can be way off! Always double-check that your protractor is snug against the angle's vertex and that your reading is taken from the right scale.