You can extend those lines at any time with a straight edge. Remember that it may help to extend either of those lines to take better readings. If the measure is acute, the scale must be less than 90 °. If the measure is obtuse, the scale must be greater than 90 °. You will need to use your classification of angles understand which scale is proper for your measure. These numbers will tell you about the measure in degrees of the edge of the line on the opposite end. In one direction it read 0 ° to 180 ° and the same in the opposite direction. Notice that the protractor shows two numbers on two different scales. We will look at the other line that is touching the zero edge and see if that were extended infinitely would touch on the protractor scale. That bottom line is called the Zero edge. It should directly go over that bottom line that runs the extent of the bottom of the protractor. The edge of the bottom line should be on the centered on this line. This should be a clear whole that is actually punched through the frame. You will place this vertex in the center mark of the protractor. This is the exact point where the two lines meet. To measure an angle, you firstly need to place the protractor on the vertex of the angle. Step 1 - Line up the Vertex at Center Mark of Protractor Now, take a look at these steps, by which you can calculate the angle with ease with the help of a protractor. By knowing this, you can learn how the design of the protractor works. When you measure the angles, you must understand that angles are portions of a circle. Measuring angles can be difficult, especially when you are using a protractor. Quiz 2 - Put your skills to use for you now.Quiz 1 - Is this angle acute, right, or obtuse?.The printed protractors are a bit in your face here. The angle measurement on the inner ring where the Ring, which is the same as 180° on the outside ring.
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