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CHAPTER
LINES AND
ANGLES
∗ Def: line that do not intersect.
∗ Illustration:
∗ Notation: l || m AB || CD
PARALLEL LINES
l
m
A
B
C
D
2
Examples of Parallel Lines
• Hardwood Floor
• Opposite sides of windows, desks, etc.
• Parking slots in parking lot
• Parallel Parking
• Streets: Laramie & LeClaire
Examples of Parallel Lines
• Streets: Belmont & School
∗ Def: Lines that intersect to form a right angle.
∗ Illustration:
∗ Notation: m ⊥ n
∗ Key Fact: 4 right angles are formed.
PERPENDICULAR LINES
m
n
5
Ex. of Perpendicular Lines
• Window panes
• Streets: Belmont and Cicero
∗ Def: a line that intersects two lines at different points
∗ Illustration:
Transversal
t
7
∗ Two angles that are opposite angles.
Vertical Angles
1 2
3 4
5 6
7 8
t
∠1 ≅ ∠ 4
∠2 ≅ ∠ 3
∠5 ≅ ∠ 8
∠6 ≅ ∠ 7
∗ Find the measures of the missing angles
Vertical Angles
125 °
?
?
55 °
t
55 °
125 °
∗ Two angles that form a line (sum=180°)
Supplementary Angles/
Linear Pair
1 2
3 4
5 6
7 8
t
∠5+∠6=180
∠6+∠8=180
∠8+∠7=180
∠7+∠5=180
∠1+∠2=180
∠2+∠4=180
∠4+∠3=180
∠3+∠1=180
∗ Find the measures of the missing angles
Supplementary Angles/
Linear Pair
? 72 °
?
t
108 °
108 °
180 - 72
∗ Two angles that occupy corresponding positions.
Corresponding Angles
Top Left
t
Top Left
Top Right
Top Right
Bottom Right
Bottom Right
Bottom Left
Bottom Left
∠1 ≅ ∠ 5
∠2 ≅ ∠ 6
∠3 ≅ ∠ 7
∠4 ≅ ∠ 8
1 2
3 4
5 6
7 8
12
∗ Find the measures of the missing angles
Corresponding Angles
145 °
?
t
35 °
145 °
∗ Two angles that lie between parallel lines on opposite sides
of the transversal
Alternate Interior Angles
t
∠3 ≅ ∠ 6
∠4 ≅ ∠ 5
1 2
3 4
5 6
7 8
14
∗ Find the measures of the missing angles
Alternate Interior Angles
82 °
?
t
98 ° 82 °
∗ Two angles that lie outside parallel lines on opposite sides of
the transversal
Alternate Exterior Angles
t
∠2 ≅ ∠ 7
∠1 ≅ ∠ 8
1 2
3 4
5 6
7 8
16
∗ Find the measures of the missing angles
Alternate Exterior Angles
120 °
?
t
60 ° 120 °
∗ Two angles that lie between parallel lines on the same sides
of the transversal
Consecutive Interior Angles
t
∠3 +∠5 = 180
∠4 +∠6 = 180
1 2
3 4
5 6
7 8
p. 131 & 143
30
∗ Find the measures of the missing angles
Consecutive Interior Angles
?
t
135 °
45 °
180 - 135
Lines and angles

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Lines and angles

  • 2. ∗ Def: line that do not intersect. ∗ Illustration: ∗ Notation: l || m AB || CD PARALLEL LINES l m A B C D 2
  • 3. Examples of Parallel Lines • Hardwood Floor • Opposite sides of windows, desks, etc. • Parking slots in parking lot • Parallel Parking • Streets: Laramie & LeClaire
  • 4. Examples of Parallel Lines • Streets: Belmont & School
  • 5. ∗ Def: Lines that intersect to form a right angle. ∗ Illustration: ∗ Notation: m ⊥ n ∗ Key Fact: 4 right angles are formed. PERPENDICULAR LINES m n 5
  • 6. Ex. of Perpendicular Lines • Window panes • Streets: Belmont and Cicero
  • 7. ∗ Def: a line that intersects two lines at different points ∗ Illustration: Transversal t 7
  • 8. ∗ Two angles that are opposite angles. Vertical Angles 1 2 3 4 5 6 7 8 t ∠1 ≅ ∠ 4 ∠2 ≅ ∠ 3 ∠5 ≅ ∠ 8 ∠6 ≅ ∠ 7
  • 9. ∗ Find the measures of the missing angles Vertical Angles 125 ° ? ? 55 ° t 55 ° 125 °
  • 10. ∗ Two angles that form a line (sum=180°) Supplementary Angles/ Linear Pair 1 2 3 4 5 6 7 8 t ∠5+∠6=180 ∠6+∠8=180 ∠8+∠7=180 ∠7+∠5=180 ∠1+∠2=180 ∠2+∠4=180 ∠4+∠3=180 ∠3+∠1=180
  • 11. ∗ Find the measures of the missing angles Supplementary Angles/ Linear Pair ? 72 ° ? t 108 ° 108 ° 180 - 72
  • 12. ∗ Two angles that occupy corresponding positions. Corresponding Angles Top Left t Top Left Top Right Top Right Bottom Right Bottom Right Bottom Left Bottom Left ∠1 ≅ ∠ 5 ∠2 ≅ ∠ 6 ∠3 ≅ ∠ 7 ∠4 ≅ ∠ 8 1 2 3 4 5 6 7 8 12
  • 13. ∗ Find the measures of the missing angles Corresponding Angles 145 ° ? t 35 ° 145 °
  • 14. ∗ Two angles that lie between parallel lines on opposite sides of the transversal Alternate Interior Angles t ∠3 ≅ ∠ 6 ∠4 ≅ ∠ 5 1 2 3 4 5 6 7 8 14
  • 15. ∗ Find the measures of the missing angles Alternate Interior Angles 82 ° ? t 98 ° 82 °
  • 16. ∗ Two angles that lie outside parallel lines on opposite sides of the transversal Alternate Exterior Angles t ∠2 ≅ ∠ 7 ∠1 ≅ ∠ 8 1 2 3 4 5 6 7 8 16
  • 17. ∗ Find the measures of the missing angles Alternate Exterior Angles 120 ° ? t 60 ° 120 °
  • 18. ∗ Two angles that lie between parallel lines on the same sides of the transversal Consecutive Interior Angles t ∠3 +∠5 = 180 ∠4 +∠6 = 180 1 2 3 4 5 6 7 8 p. 131 & 143 30
  • 19. ∗ Find the measures of the missing angles Consecutive Interior Angles ? t 135 ° 45 ° 180 - 135