# Category: NCERT Class 9 Maths Notes

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### CBSE Class 9 Maths Chapter 15 Notes Probability

CBSE Class 9 Maths Chapter 15 Notes Probability Probability Class 9 Notes Understanding the Lesson 1. Experiment: A procedure which produces some well-defined possible outcomes. 2. Random experiment: An experiment which when performed produces one of the several possible outcomes called a random experiment. 3. Trial: When we perform an experiment it is called a…

### CBSE Class 9 Maths Chapter 9 Notes Quadrilaterals

CBSE Class 9 Maths Chapter 9 Notes Quadrilaterals Quadrilaterals Class 9 Notes Understanding the Lesson Quadrilateral A plane figure bounded by four line segments is called quadrilateral. Properties: It has four sides. It has four vertices or comers. It has two diagonals. The sum of four interior angles is equal to 360°. In quadrilateral ABCD,…

### CBSE Class 9 Maths Chapter 8 Notes Linear Equations in Two Variables

CBSE Class 9 Maths Chapter 8 Notes Linear Equations in Two Variables Linear Equations in Two Variables Class 9 Notes Understanding the Lesson 1. Equation: An equation is a mathematical statement that two things are equal. It consists of two expressions one on each side of an equals sign. For example,7x + 9 = 0…
CBSE Class 9 Maths Chapter 7 Notes Heron’s Formula Heron’s Formula Class 9 Notes Understanding the Lesson 1. Area of triangle with base ‘b’ and altitude ‘h’ is Area = $$\frac{1}{2}$$(b x h) 2. Area of an isosceles triangle with equal sides ‘a’ each and third side b is Area $$=\frac{b}{4} \sqrt{4 a^{2}-b^{2}}$$ 3. Area…