Segments Lines Rays and Angles Vocabulary

part of a line between two points on the line (endpoints)

• ray

• line

• line segment

• point

Define Acute

• Less than 90

• Exactly 90

• Greater than 90 and less than 180

• Exactly 180

Define Obtuse

• Less than 90

• Exactly 90

• Greater than 90 and less than 180

• Exactly 180

An angle whose measure is exactly 90 degrees.

• acute

• vertical

• right

• straight

an angle that measures greater than 90* but less than 180*

• acute angle

• obtuse angle

• straight angle

• right angle

part of a line that begins at one endpoint and continues without end in one direction

• ray

• point

• line segment

• line

an angle that measures exactly 90*

• acute angle

• obtuse angle

• straight angle

• right angle

Two rays joined at a common endpoint

• point

• line

• angle

• segment

How many degrees is a straight angle?

• 90

• 360

• 180

• 145

• Segment addition
• Congruent segments
• Circumcenter
• bisector