1. ANGLES
Types of
Angles
Nichole Graham-Treston

2. TYPES OF ANGLES
Right
angles are 90o.
Acute angles are less than 90o.
Obtuse angles are more than 90o but
less than 180o.
Reflex angles are more than 180o.
Straight angles are measured at
180°

3. RIGHT ANGLE

measures 90°
The angle is marked
with a box

4. ACUTE

less than 90°

5. REFLEX

more than 180° but less than 360°

6. OBTUSE

Obtuse - more than 90° but less than 180°

7. STRAIGHT ANGLE
Measures 180°

8. CAN YOU NAME THE
FOLLOWING
ANGLES????

9. WHAT TYPE OF ANGLES ARE
THESE?
Acute

10. WHAT TYPE OF ANGLES ARE
THESE?
Obtuse Angles

11. WHAT TYPE OF ANGLES ARE
THESE??
Right Angles

12. WHAT TYPE OF ANGLES ARE
THESE??
Reflex Angles

13. WHAT TYPE OF ANGLES ARE
THESE???
Straight Angles

14. As the angle increases
its name changes.
A – acute
R – right
O – obtuse
S – straight
R - reflex
Straight