Refer to Figure above. Spend some time moving Ray CD. Define a linear pair.
A pair of ADJACENT angles whose non-common sides lie on the same line (non-common sides are opposite rays). [br][br]Adjacent supplementary angles.
Figure 2
Use Figure 2 above by moving points D and G. After spending some time with Figure 2, define complementary angles.
A pair of angle whose measures SUM to 90 degrees
Figure 3
Use Figure 3 above by moving points D and G. After spending some time with Figure 3, define supplementary angles.
A pair of angle whose measures SUM to 180 degrees
Figure 4
Use Figure 4 above by moving points A and C. After spending some time with Figure 4, define vertical angles (the 2 greee angles are vertical and the two red angles are vertical.
Non-adjacent angles formed by intersecting lines. Share a common vertex and sides are opposite rays.[br]AKA opposite angles