1. 3:2
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2. Types of Angle
Acute angles
1 2 3
Acute angles are angles less than 90o

3. 90o
on a
protractor
Types of Angle
Right angles
A right angle is an angle of 90oVertical
Horizontal
A right angle
will occur
when a
horizontal
line and a
vertical line
meet.
Horizontal
Vertical
Vertical
HorizontalHorizontal
Vertical
1 2 3
If the angle
between two
lines is a right
angle then the
lines are
perpendicular
to each other.

4. Vertical
Horizontal
Types of Angle
Right angles
Perpendicular lines
Perpendicular lines

5. Which simple shapes contain right-angles?

6. 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

7. Types of Angle
Obtuse angles
1 2 3
Obtuse angles are greater than 90o
but less 180o

8. 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

9. Types of Angle
Straight angles
180o
on a
protractor180o
on a
protractor
A straight angle is an angle of 180o

10. Types of Angle
Reflex angles
Reflex angles are greater than 180o
but less than 360o
1 2 3 4

11. 1 2 3
4 5 6
7 8 9
Acute Obtuse Acute
Reflex
Right
Obtuse
Acute Reflex Obtuse