Lines and angle relationships

• ∠3
• ∠7
• ∠2
• ∠4

• ∠5
• ∠7
• ∠1
• ∠4

• ∠4
• ∠6
• ∠2
• ∠1

• ∠1
• ∠4
• ∠8
• ∠3

• 48
• 12
• 36
• 432

• 9
• 10
• 15
• 30

• 36.66667
• 25
• 20
• 65

• 80
• 150
• 30
• 70

• Yes by the Alternate interior angles theorem converse.
• Yes by the alternate exterior angle theorem converse.
• Yes by the corresponding angles theorem converse.
• The lines are not parallel.

• Yes by the consecutive angles theorem converse.
• The lines are not parallel.
• Yes by the corresponding angles theorem converse.
• Yes by the alternate interior angles theorem converse.