Chapter 15 Math Vocabulary

The direction that hands on a clock move...

• clockwise
• vertically
• diagonally
• counterclockwise

The direction that is opposite of how hands on a clock move...

• Counterclockwise
• Vertical
• Clockwise
• Diagonal

The point where two rays or line segments meet to form an angle...

• intersection
• endpoint
• corner
• vertex

The unit of measure used for measuring angles...

• radians
• gradians
• mils
• degrees

Recognized angles used to classify and estimate angle measures (30, 45, 60, 90)

• benchmark angles

• opposite angles

• congruent angles

• matrix angles

The tool used for measuring angles...

• ruler
• protractor
• compass
• caliper

An angle grater than 0 degrees but less than 90 degrees...

• acute angle
• reflex angle
• right angle
• obtuse angle

An angle greater than 90 degrees but less than 180 degrees...

• acute angle
• straight angle
• right angle
• obtuse angle

An angle that measures exactly 180 degrees...

• acute angle
• reflex angle
• obtuse angle
• straight angle

An angle that measures exactly 90 degrees...

• Acute angle
• Straight angle
• Obtuse angle
• Right angle