Learn about the types of angles that are formed by intersecting and parallel lines with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

Class 9 Maths NCERT Book Chapter 6 - Lines and Angles is provided here in PDF format. Get the latest edition of the chapter to prepare for your Maths Exam in the 2021-2022 session.

If you have forgotten your basic geometry, parallel lines are represented by the little squares you see above, which signify 90-degree angles.