# CBSE Notes For Class 9 Maths

Rational numbers Irrational numbers Locating irrational numbers on the number line Real numbers and their decimal expansions Representing real numbers on the number line Operations on real numbers Rationalisation of denominator………..READ MORE

• Coordinate Geometry

Cartesian system Coordinate axes Origin Quadrants  Abscissa Ordinate oordinates of a point Ordered pair Plotting of points in the cartesian plane: In the Cartesian plane, the horizontal line is called the x-axis and the vertical line is called the y-axis,………..READ MORE

Degree of a polynomial Coefficients  Monomials, Binomials etc.  Constant, Linear, Quadratic Polynomials etc.Value of a polynomial for a given value of the variable Zeroes of a polynomial Remainder ………..READ MORE

An equation is a statement in which one expression equals to another expression. An equation of the form ax + by + c = 0, where a, b and c are real numbers such that a ≠ 0 and b ≠ 0, is called a linear equation in two variables. The process of finding solution(s) is called solving an equation.………..READ MORE

Points, Line, Plane or surface, Axiom, Postulate and Theorem, The Elements, Shapes of altars or vedis in ancient India, Equivalent versions of Euclid’s fifth Postulate, Consistency of a system of axioms. Ancient India The geometry of the Vedic period originated with the construction of altars (or vedis) and fireplaces for performing Vedic rites. Square and circular altars were used for  ………..READ MORE

Complementary angles, Supplementary angles, Adjacent angles, Linear pair, Vertically opposite angles.If a ray stands on a line, then the adjacent angles so formed are supplementary and its converse,If two lines intersect, then vertically opposite angles are equal, If a transversal intersects two parallel lines, then  corresponding angles are equal and conversely,………..READ MORE

Triangles and their parts, Congruence of triangles, Congruence and correspondence of vertices, Criteria for Congruence of triangles: (i) SAS (ii) ASA (iii) SSS (iv) RHS AAS criterion for congruence of triangles as a particular case of ASA criterion.………..READ MORE

Sides, Angles and diagonals of a quadrilateral; Different types of quadrilaterals: Trapezium, parallelogram, rectangle, rhombus and square. Sum of the angles of a quadrilateral is 360º,A diagonal of a parallelogram divides it into two congruent triangles, In a parallelogram  opposite angles are equal………..READ MORE

• Parallelograms Triangles

• Circles

• Heron’s Formula

• Surface Area