RYAN B

ANGLES

• Have ONE vertex
• Consist of two rays that meet at a point
• Have perfectly straight lines
• Angles are measured in degrees(°)
• Angles are measured with protractors

RIGHT ANGLES

• All right angles are exactly 90°
• No right angle can be more or less than 90°
• A right angle always has a box where the lines meet

ACUTE ANGLES

• All acute angles are less than 90°
• All angles less than 90° are acute
• The vertex is marked by a curved line

OBTUSE ANGLES

• All obtuse angles are more than 90° and less than 180°
• All angles less than 180° and more than 90° are obtuse
• The vertex is marked by a curved line

STRAIGHT ANGLES

• All straight angles are exactly 180°
• No straight angle can be more or less than 180°
• It looks sometimes like just a line but it really is an angle

REFLEX ANGLES

• A reflex angle is always more than 180° and less than 360°
• Any angle less than 360° and more than 180° is a reflex angle
• The curve (called an arc) of a reflex indicates how to measure it
• The arc of a reflex angle will always be more than a half circle

THANKS!