Which Angle Is Which?

When you hear the word angle, you probably think of right angles, acute angles, and obtuse angles, but what you may not know is that there are a lot more angles that you can find easily! 

Vertical Angle: Two angles that have are opposite each other when their two lines cross, they share the same vertex, and their sides are opposite  rays.  Vertical angles make the shape of an X. If you look at the picture above "C" and "B" are examples of vertical angles. 

Corresponding angles: Two angles that are matching each other, an example of corresponding angles are angle "G" and angle "C"

Alternate Interior Angle: When two lines are cut by a transversal, these angles are between the two lines and are on opposite sides of the transversal. Angle "C" and angle "F" are Alternate Interior angles.

Alternate Exterior Angle:  When two lines are cut by a transversal, these angles are outside of the two lines and are on opposite sides of the transversal. Angle "G" and angle "B" are alternate exterior angles.

Complementary Angles: Two angles whose measures have a sum of 90 Degrees.  The angle labeled 45° in the diagram, combined with Angle "E" which is also 45° would be complementary since their sum is 90°

Supplementary Angles: Two angles whose measures have a sum of 180 Degrees. Angle "E" and angle "F" are supplementary angles. 

You can practice finding Supplementary and Complementary Angles at AAAMath.com