Geometry/Chapter 13

Complementary angles are angles that the sum of their measures is equal to 90º.

File:D:\Media\Photos\Adobe illlustrate images\School\Sec 2\Algebra\complementary angles.jpg

complementary angles

File:Complementary angles|thumbnail|center </gallery> ]] Supplementary angles are angles that the sum of their measures is equal to 180º.

 90º              __|__               90º
_________________|__|__|____________________

Vertical Angles

In the above diagram, A and C are vertical angles, and B and D are vertical angles. Vertical angles are congruent.

Exercises

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• Geometry/Chapter 13 Angles: Complementary, Supplementary, Vertical
• Geometry/Chapter 14 Pythagorean Theorem: Proof
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• Geometry/Chapter 22 Rigid Motion
• Geometry/Appendix A Formulae
• Geometry/Appendix B Answers to problems
• Appendix C. Geometry/Postulates & Definitions
• Appendix D. Geometry/The SMSG Postulates for Euclidean Geometry