The document explains basic concepts related to angles in geometry, including definitions of acute, right, obtuse, and straight line angles. It also describes complementary and supplementary angles, as well as vertical angles. Additionally, it includes evaluation questions to assess understanding of these concepts.

1. STANDARD: 6th.

2. RAY
RAY

3. What is angle?
The two rays which
connect the line is
called angles.

4. ACUTE ANGLE

5. An angle whose measure is less than 90 degrees
is known as acute angle.

6. RIGHT ANGLE

7. An angle whose measure is 90 degrees is known
as right angle.

8. OBTUSE ANGLE

9. An angle whose measure is higher than 90 degrees but
less than 180 degrees is known as obtuse angle.

10. STRAIGHT LINE ANGLE

11. STRAIGHT LINE ANGLE
An angle whose measure is 180 degrees is known as
straight line angle.

12. COMPLEMENTARY ANGLES

13. Two angles whose measures add to 90 degrees
which form a right angle is known as
complementary angles.

14. SUPPLEMENTARY
ANGLES

15. SUPPLEMENTARY ANGLES
Two angles whose measures add to 180 degrees is
known as supplementary angles.

16. An angles have a common vertex and whose sides are
formed by the same lines is known as vertical
angles.

17. VERTICAL ANGLES

18. VERTICAL ANGLES

19. EVALUATION
1) What is an angle?
2) What is an acute angle?
3) Explain right angle.
4) Explain obtuse angle.
5) What is complementary angle?
6) What is vertical angles?