Angle Relationships

1. Find X 

• 28
• 5
• 55
• 40

1. Find ∠ AOC 

• 130
• 50 
• 40

2. Find X

• 9
• 27
• 45

If m∠1 = 30°, then m∠3 = 

• 30°
• 60°
• 150°
• undetermined

Which are pairs of vertical angles?

• ∠COB & ∠COA
• ∠AOD & ∠AOC
• ∠COB & ∠AOD
• ∠BOD & ∠AOD

What are vertical angles?

• Angles that are adjacent to each other
• Angles that add up to 180°
• Angles that are opposite of each other when lines intersect
• Angles that add up to 90°

Vertical angles are always

• acute
• total 180 degrees
• congruent (equal measures)
• adjacent angles

Name a pair of angles that are vertical.

• Angles 4 and 5
• Angles 7 and 9
• Angles 8 and 9
• Angles 5 and 7

What type of angles are these?

• Adjacent Angles

• Linear Pair

• Complementary Angles

• Supplementary Angles

• Vertical Angles

• x = 118

• x = 108

• x = 28

• x = 58

• x = 62