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Triangle Sum Theorem Pre Algebra

geometry<br>math 8<br>pre-algebra

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Triangle Sum Theorem Pre Algebra

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  1. Good Morning! 01/14/22

  2. 78° 57° 42°

  3. 59° 60° 41°

  4. The two angles shown are same-side interior, so they are supplementary. 16x - 7 + 30x + 3 = 180 46x - 4 = 180 +4 +4 46x = 184 46 46 x = 4 Angle BFE: 30x + 3 30(4) + 3 120 + 3 123° 123°

  5. Test the math for each coordinate: Multiply the x-coordinate by 4, then subtract 3. Which one results in the correct y-coordinate? Test A: 4(4)-3 = 16 - 3 = 13 Not correct because the y-coordinate is 11. Test B: 4(11) - 3 = 44 - 3 = 41 Not correct because the y-coordinate is 4. Test C: 4(4) - 3 = 16 - 3 = 13 Correct!!! The answer is C. Test D: 4(13) - 3 = 52 - 3 = 49 Not correct because the y-coordinate is 4.

  6. Stop at 4:40

  7. Answer key Angles on the inside of the shape Angles on the outside of the shape Same shapes with the ratios of the lengths of the corresponding sides are equal ⦟A + ⦟B + ⦟C = 180° ⦟X + ⦟Y + ⦟Z = 360°

  8. Practice - Angles of Triangles Practice Problems

  9. Answers to Practice Problems

  10. Practice - Angles of Triangles Practice Problems

  11. Answers to Practice Problems

  12. Practice - Angles of Triangles Practice Problems

  13. Answers to Practice Problems

  14. Practice - Angles of Triangles Practice Problems

  15. Answers to Practice Problems

  16. Practice - Angles of Triangles Practice Problems

  17. Answers to Practice Problems

  18. Practice - Angles of Triangles Practice Problems

  19. Answers to Practice Problems

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