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ARMY AIR FORCES

d. Exercise: Measure each of the angles in figures 40,41,42, and 43.



FIGURE 40.           FIGURE 41.



FIGURE 42.             FIGURE 43.

e. To construct an angle with a protractor.-Draw one side of the angle and locate the vertex. Place side AB
of the protractor on the side drawn with point O of the protractor on the vertex. Locate the reading of the value of the angle required on the scale of the protractor and connect this with the vertex. Measure the angle by starting at the north line.

(1) Example: Lay off an angle of 115°.
   Solution: First draw the north line, then follow the instructions in c above (see fig.44)

(2)Exercise:  Use a protractor and lay off angle of 30°,135°,180°,240°,and 315°.
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