Welcome to CBSE Class IX Maths Book. This Book consists of 15 Chapters. 1. Number Systems. 2. Polynomials. 3. Coordinate Geometry. 4. Linear Equations in two variables. 5. Duction to Elucid's Geometry. 6. Lines and Angles. 7. Triangles. 8. Quadrilaterals. 9. Areas of Parallelograms. 10. Circles. 11. Constructions. 12. Heron's Formula. 13. Surface Areas and Volumes.