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PARALLEL LINES, TRANSVERSALS AND SPECIAL ANGLES

PARALLEL LINES, TRANSVERSALS AND SPECIAL ANGLES. Section 3-1, 3-2. Jim Smith JCHS. A Line That Intersects 2 Or More Lines At Different Points Is Called A Transversal. transversal. 3. 1. 5. 7. 4. 2. 6. 8. When This Happens, 8 Angles Are Formed. 5. 1. 3. 7. 4. 6. 8. 2.

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PARALLEL LINES, TRANSVERSALS AND SPECIAL ANGLES

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  1. PARALLEL LINES, TRANSVERSALS AND SPECIAL ANGLES Section 3-1, 3-2 Jim Smith JCHS

  2. A Line That Intersects 2 Or More Lines At Different Points Is Called A Transversal transversal

  3. 3 1 5 7 4 2 6 8 When This Happens, 8 Angles Are Formed

  4. 5 1 3 7 4 6 8 2 This Forms 2 Neighborhoods

  5. Remember Vertical And Linear Angles Vertical 3 7 5 1 4 6 8 2

  6. Linear Pairs 3 7 5 1 4 6 8 2

  7. 5 1 3 7 4 6 8 2 These Angles Are Called Consecutive Or Same Side Angles

  8. 5 3 4 6 1 7 8 2 Interior Angles (Between 2 lines) Exterior Angles (outside the lines)

  9. Alternate Angles Are On Different Sides Of The Transversal And From Different Neighborhoods Alternate Exterior Angles 1 And 8 Angles 2 And 7 Alternate Interior Angles 3 And 6 Angles 4 And 5 5 1 3 7 4 6 8 2

  10. Consecutive Int Angles 3 and 5 Angles 4 and 6 5 3 4 6 Consecutive Ext Angles 1 and 7 Angles 2 and 8 1 7 8 2

  11. 3 7 5 1 4 6 8 2 Corresponding Angles Are Located In The Same Position In Each Neighborhood

  12. 12 11 14 13 15 16 17 18 Name The Angles • 11 and 15 • 12 and 16 • 13 and 16 • 12 and 18 • 14 and 16 • 14 and 18 • 11 and 14 • 15 and 17

  13. Check Your Answers • Corresponding • Corresponding • Alt Interior • Consecutive (SS) Exterior • Consecutive (SS) Interior • Corresponding • Vertical • Linear

  14. Name the angles • 1 and 3 • 7 and 12 • 11 and 14 • 6 and 10 • 13 and 5 • 9 and 6 • 1 and 13 • 5 and 4 • 7 and 11 • 6 and 11 4 3 2 1 8 7 6 5 12 11 10 9 16 15 14 13 With This Diagram, We Can Work With Angles In Different Neighborhoods As Long As They Are Connected By A Transversal

  15. Check Your Answers • Corresponding • Alt. Int. • Alt. Int. • Cons. (SS) Int. • Corresponding • Alt. Int. • Consecutive Ext • Alt. Ext • Cons. (SS) Int. • None

  16. Parallel lines Lines that are coplanar and do not intersect

  17. If 2 Parallel Lines Are Cut By A Transversal Then: Corresponding Angles Are Congruent Alternate Interior Angles Are Congruent Same Side Interior Angles Are Supplementary

  18. Remember ……… Even Without Parallel Lines Vertical Angles Are Always Congruent Linear Pairs Are Always Supplementary

  19. a b 1 2 a 3 4 6 5 b 8 7 m 1 = 105 • Find: • 3 = • 6 = • 7 = • 4 = • 5 = 75 75 75 105 105

  20. 119° 63° 1 2 a 61° 119° 117° 3 4 119° 63° 63° 6 5 b 8 7 119°

  21. a b 2x+6 4x+25 5x-20 3x-10 6x-15 2x-10 4x+25 = 6x-15 25 = 2x-15 40 = 2x 20 = x 2x+6 = 3x-10 6 = x – 10 16 = x 5x-20+2x-10 = 180 7x-30 = 180 7x = 210 x = 30

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