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Types of Angle Acute angles Acute angles are angles less than 90 o

90 o on a protractor Types of Angle Right angles A right angle is an angle of 90 o Vertical Horizontal A right angle will occur when a horizontal line and a vertical line meet. Horizontal Vertical Horizontal Vertical If the angle between two lines is a right angle then the lines are perpendicular to each other.

Vertical Horizontal Types of Angle Right angles Perpendicular lines

Which simple shapes contain right-angles?

Can Pentagons, Hexagons and Octagons have right-angles? Regular PentagonRegular Hexagon Regular Octagon Irregular Pentagon Irregular Hexagon Irregular Octagon 6 six 5 five 8 Eight

Types of Angle Obtuse angles Obtuse angles are greater than 90 o but less 180 o

What types of angle can you see in the shapes below? Regular PentagonRegular Hexagon Regular Octagon Irregular Pentagon Irregular Hexagon Irregular Octagon 6 six 5 five 8 Eight

Types of Angle Straight angles 180 o on a protractor A straight angle is an angle of 180 o

Types of Angle Reflex angles Reflex angles are greater than 180 o but less than 360 o

Acute Obtuse Acute Reflex Right Obtuse Acute Reflex Obtuse