Class 9 Basics of line and angles
- 1. Class – IX Basics of lines and angles Name: Sandeep Jaiswal Reg. no.: 11813483 Integrated. B.sc B.Ed. Lovely Professional University
- 3. When two lines crosses we get angles.
- 4. • An angle is formed when two rays originate from the same end point. • The rays making an angle are called the arms of the angle. • The end point is called the vertex of the angle. O
- 5. We can find lot of angles in this image
- 6. Types of angles ?
- 8. • An acute angle measures between 0°and 90°. • Whereas a right angle is exactly equal to 90°. • An angle greater than 90°but less than 180°is called an obtuse angle. • A straight angle is equal to 180°. • An angle which is greater than 180°but less than 360°is called a reflex angle.
- 9. Adjacent angles • Two angles are adjacent, if they have a common vertex, a common arm and their non-common arms are on different sides of the common arm.
- 10. Ways to draw two lines?
- 11. • If a ray stands on a line, then the sum of two adjacent angles so formed is 180°. • when the sum of two adjacent angles is 180°, then they are called a linear pair of angles.
- 12. THANKYOU