Angle Relationships

1. Find X 

• 28
• 5
• 55
• 40

2. Find X

• 9
• 27
• 45

3. Find X

• 59
• 31
• 177

4. Find X

• 1
• 30
• 53
• 10

If m∠1 = 30°, then m∠3 = 

• 30°
• 60°
• 150°
• undetermined

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

What is the value of x?

• 37
• 72
• 108
• 18

Name a pair of angles that are vertical.

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

∠1 and ∠3 can best be described as -

• complementary angles
• supplementary angles
• vertical angles
• adjacent angles