Unit 4 Angle Relationships

Match the following angle relationships to their definitions.

• Two angles whose sum is 90 degrees

• Vertical Angles

• Two angles that share a common side and have the same vertex.

• Complementary Angles

• Equal and opposite angles that share a vertex in the center

• Supplementary Angles

• Two angles whose sum is 180 degrees

• Adjacent Angles

The angle relationship shown is -

• complementary angles
• supplementary angles
• vertical angles
• angle bisector

∠1 and ∠3 can best be described as -

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

∠AOB and ∠COB can best be described as - 

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

The angle relationship shown is - 

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

If m∠1 = 30°, then m∠3 = 

• 30°
• 60°
• 150°
• undetermined

Find the missing angle.

• 60
• 70
• 50
• 140

What is an example of a pair of complementary angles?

• 13° and 45°
• 10° and 170°
• 81° and 9°
• 90° and 3°

∠AOB and ∠COB can best be described as - 

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

Find the value of x.

• 15

• 16

• 18

• 19