The document defines and provides examples of the six main types of angles: acute angles which are less than 90 degrees; right angles of 90 degrees; obtuse angles between 90 and 180 degrees; straight angles of 180 degrees; reflex angles between 180 and 360 degrees; and complete angles of 360 degrees. Examples are given for each type of angle to illustrate their defining characteristics and measures.

2. presented by ,
J. Merlin Raja Beryl,
Department of
Mathematics .
Types of Angles

3. Angle
If two rays have an
common end point they form
an angle .
The two rays forming an
angle are called the arms of
the angle . The common end
point is called a vertex of the
angle .

4. Types of angles
Depending on the
position of the arms ,there are
different types of angles .
Let's learn about them...

5. Types of Angles
There are 6 Types of angles:
 Acute angle.
 Right angle.
 Obtuse angle.
 Straight angle.
 Reflex angle.
 Complete angle.

6. Acute angle
An angle whose
measure is more than 0°
but less 90° is called an
acute angle
.
Example : 30°, 45°,etc

7. Acute angle
Example:
0°<55°<90°

8. Examples for acute angleExamples for acute angle

9. Right angle
An angle whose measure is 90°
is called a right angle .
Example :90°

10. Other examples for right angle

11. Obtuse angle
An angle whose measure is
greater than 90°and less than
180° is called an obtuse angle .
Example :100°,160°, etc

12. Other examples for obtuse angle:

13. Straight angle
An angle whose measure is
180° is called a straight angle.
Example :180°

14. Straight angle
Example:
::::

15. Reflex angle
An angle whose
measure is greater than
180° and less than 360° is
called reflex angle .
Example :230°, 320°

16. Reflex angle
Examples:

17. Complete angle
When the arms take
the complete turn then the
angle of measure 360° is
formed . This type of angle is
called a complete angle .

18. Complete rotation
Example :

19. Remember :