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Geometry/Chapter 13
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Complementary angles are angles that the sum of their measures is equal to 90º.
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Supplementary angles are angles that the sum of their measures is equal to 180º.
90º __|__ 90º
_________________|__|__|____________________
Vertical Angles
Image:Vertical_Angles.jpg
In the above diagram, A and C are vertical angles, and B and D are vertical angles. Vertical angles are congruent.
Exercises
Chapter 12 Chapter 14 Geometry (book)