Reasoning in Algebra and Geometry

An angle that measures less than 90°

• Acute
• Obtuse
• Right
• Straight

This is what kind of angle?

• right
• acute
• obtuse
• straight

Which type of angle is pictured?

• Acute
• Right
• Obtuse
• Straight

What kind of angles are shown?

• complementary
• supplementary
• adjacent
• corresponding

What are complementary angles?

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

If m∠1 = 30°, then m∠3 = 

• 30°
• 60°
• 150°
• undetermined

Vertical angles are always

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

Find the missing angle.  Find x.

• 20^o
• 70^o
• 160^o
• 180^o

Which are pairs of vertical angles?

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

complementary, supplementary, or neither?

• Complementary
• Supplementary
• Neither