Math Open Reference

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Angles

• Definition of an angle
• Interior of an angle

Angle measure

• Degrees, minutes, seconds
• The protractor
• Using a protractor to measure angles
• Using a protractor to draw angles
• Radians

Types of angle

• Acute angle
• Obtuse angle
• Right angle
• Straight angle
• Reflex angle
• Full angle
• Quiz: Test your knowledge of angle types

Angle relationships

• Adjacent angles
• Included angle
• Supplementary angles
• A linear pair
• Complementary angles
• Angle bisector
• Vertical angles
• Subtended angles

Angles around a transversal

• See Parallel lines chapter
• Corresponding angles
• Alternate interior angles
• Alternate exterior angles
• Interior angles of a transversal
• Exterior angles of a transversal

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