Classifying angles

An angle that is exactly 90 degrees.

• right
• acute
• obtuse
• straight

An angle that is exactly 180^o.

• right
• acute
• obtuse
• straight

An angle that is less than 90^o.

• right
• acute
• obtuse
• straight

An angle that is more than 90^o.

• right
• acute
• obtuse
• straight

The point where 2 rays meet is called the....

• right angle
• acute angle
• vertex
• congruent

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 does it mean if two angles are adjacent?

• They share a side and a vertex
• They are opposite each other across an intersection of two lines
• They share only a vertex, not a side
• none of the above

Find the missing angle.  Find x.

• 20^o
• 70^o
• 160^o
• 180^o

Complementary angles make what angle measure when they are next to each other?

• Right angle, 90 degrees

• Straight angle, 180 degrees

• Weird angle, 10 degrees

• Unknowable angle, 400 degrees