Solving problems involving angles and equations

If we are given that angles C and D are complementary angles what can we conclude?

• C + D = 180 by definition of right angles
• C + D = 90 by definition of complementary angles
• C + D = 180 by definition of complentary angles
• C and D are congruent angles

A square is...

• 180 degrees

• 360 degrees

• 90 degrees

Complementary angles -

• are congruent

• sum to 90^o

• sum to 180^o

Then find the value of x.

• x=23
• x=5
• x=13
• x=2

Find angle x.

• $5\degree$

• $45\degree$

• $25\degree$

• $35\degree$

Use the diagram to solve for m∠BAD.  ∠CAB is a right angle.
m∠1 = (x² -5x)° and m∠2 = (3x+42)°.

• 24° & 66°
• Only 24°
• Only 66°

What do complementary angles equal

• 180

• 80

• 90

• 67

Find the missing angle.

• 60
• 70
• 50
• 140

Find the missing angle.

• 20^o

• 70^o

• 160^o

• 180^o

• Vertical Angle Theorem

• Complement Theorem

• Definition of Complementary Angles

• Congruent Complements Theorem