This document defines and describes different types of angles: - An acute angle measures between 0 and 90 degrees. A right angle measures exactly 90 degrees. An obtuse angle measures greater than 90 degrees but less than 180 degrees. - A straight angle measures exactly 180 degrees. A reflex angle measures more than 180 degrees but less than 360 degrees. A complete angle measures exactly 360 degrees.

1. What is this ?

2. Then,
What is line segment ?

3. What is this?

4. Then,
What is ray?

6. What is vertex?
Then ,
What is angle?

7. An angle is formed when two rays
originate from the same endpoint .The
rays making an angle are called arms of
the angle and the end point is called the
vertex of the angle .

8. Which are the types of
angles?

9. Today in this class,we are going to
learn about different types of
angles.

25. From all these activities
what do you generalize?

26. Acute angle
An acute angle measures between
0° and 90°.
Right angle
Right angle measures exactly equal
to 90°.
Obtuse angle
An angle measures greater than
90° but less than 180°.

27. Construct the some more
examples of acute
angle,obtuse angle & right
angle.

28. 1. What is Acute angle?
2. What is obtuse angle?
3.What is right angle?

40. From all these activities what do
you generalize?

41. Straight angle
An angle whose measures exactly
equal to 180°.
Reflex angle
A reflex angle whose measures more
than 180° and less than 360°.
Complete angle
An angle whose measure is exactly
eequal to 360°.

42. Which type of angle?

43. 1. What is straight angle?
2.What is reflex angle?
3.what is complete angle?

44. Today in this class,we learnt
about different types of angles.

45. Thank you