1. Mathematics: In Class 9, you’ll build upon the concepts learned in Class 8 and tackle more advanced topics, such as: Number System: Real Numbers, Rational and Irrational Numbers, and their properties. Algebra: Polynomials, Linear Equations in two variables. Geometry: Euclid’s Geometry, Lines and Angles, Triangles, Congruence of Triangles, Areas of Parallelograms and Triangles. Trigonometry: Introduction to Trigonometric Ratios. Statistics: ...