Class 9 Mathematics – Circles & Coordinate Geometry Notes (Conceptual) 1. Circles Definition A circle is a set of all points in a plane that are at a fixed distance from a fixed point called...
Polynomials (Conceptual Notes) What is a Polynomial? A polynomial is an algebraic expression made of one or more terms. Each term is made up of a coefficient (number) and a variable (letter),...
Heron’s Formula (Conceptual) Used to find the area of a triangle when you know the lengths of all three sides. Instead of measuring height, you can calculate area directly from the sides. Helpful...
What is a Triangle? A triangle is a closed figure with three sides and three angles. The sum of all three angles in a triangle is always 180°. Triangles are the simplest polygon. 2....
What is a Quadrilateral? A quadrilateral is a closed figure with four sides and four angles. The sum of all angles in a quadrilateral is always 360°. 2. Types of Quadrilaterals (Based...