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Do Now

Do Now. What do you call a 90° angle?. A right angle!. Definition: An angle is a right angle iff it is 90 °. Theorem: If two angles are right angles, then they are congruent. Remember: We have to *prove* theorems!. D. B. B. A. C. A. What do you call two angles that add up to 90°?.

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Do Now

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  1. Do Now

  2. What do you call a 90° angle? A right angle! Definition: An angle is a right angle iff it is 90°.

  3. Theorem: If two angles are right angles, then they are congruent Remember: We have to *prove* theorems!

  4. D B B A C A What do you call two angles that add up to 90°? Definition: Two angles that add up to 90° are COMPLEMENTARY!

  5. Theorems about Complementary Angles: • Theorem: If two angles are complements of the same angle, then they are congruent. Let’s Prove It!!!!!!!!!!!!!!!!

  6. Theorem: If two angles are congruent, their complements are congruent. Oh em gee pruv it.

  7. Homework Prove theorem 5 and 6 on pg. 144. Make a list of the theorems/postulates/definitions separate from your notes. I will be checking this every week. THIS WILL HELP YOU WHEN YOU DO PROOFS!

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