Class 9 Maths NCERT Book also works without internet Chapter included in Class 9 maths Book : Chapter 1: Number System Chapter 2: Polynomials Chapter 3: Coordinate Geometry Chapter 4: Linear Equations in two Variables Chapter 5: Introduction to Euclid's Geometry Chapter 6: Lines and Angles Chapter 7: Triangles Chapter 8: Quadrilaterals Chapter 9: Areas of Parallelograms And Triangles Chapter 10: Circles Chapter 11: Constructions Chapter 12: Heron's Formula Chapter 13: Surface Areas And Volumes Chapter 14: Statistics Chapter 15: Probability