# NCERT NOTES ## NCERT notes and solutions for class 7 Geography chapter 4 AIR

NCERT notes and solutions Class 7 Geography Chapter 4 AIR Atmosphere-  It is a blanket of air that surrounds our earth. It protects us from harmful ultraviolet rays. Composition of the atmosphere- Earth atmosphere is made up of Nitrogen (78%) Oxygen (21%) Carbon dioxide (0.037)… Read More »NCERT notes and solutions for class 7 Geography chapter 4 AIR ## NCERT notes and solutions for class 7 Geography chapter 3 OUR CHANGING EARTH

NCERT notes and solutions Class 7 Geography Chapter 3 OUR CHANGING EARTH Lithosphere Plate– The lithosphere is made up of a number of plates called the lithosphere plate. It moves a few millimeters each year because of magma present inside the earth. The movement of… Read More »NCERT notes and solutions for class 7 Geography chapter 3 OUR CHANGING EARTH ## NCERT Notes and Solutions for Class 7 Geography Chapter -2 Inside the Earth

NCERT Notes and Solutions for Class 7 Geography Chapter -2 Inside the Earth The earth is the only planet in the solar system in which life exists. Interior of the Earth: The earth has serval layers, one inside another. The uppermost layer of the earth’s… Read More »NCERT Notes and Solutions for Class 7 Geography Chapter -2 Inside the Earth ## NCERT Notes and Solutions for Class 7 Geography Chapter -1 Environment

NCERT Notes and Solutions for Class 7 Geography Chapter -1 Environment Environment – It is derived from the French word Environner having meaning neighbourhood. The environment is basic life support which provides the air, the water, the food, and the land. We can define the… Read More »NCERT Notes and Solutions for Class 7 Geography Chapter -1 Environment ## NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry (Exercise – 8.4)

NCERT solutions for class 10 Maths Chapter 8 Introduction to Trigonometry Exercise 8.4 Ex 8.4 Question 1. Express the trigonometric ratios sin A, sec A and tan A in terms of cot A. Solution: Ex 8.4 Question 2. Write all the other trigonometric ratios of… Read More »NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry (Exercise – 8.4) ## NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry (Exercise – 8.3)

NCERT solutions for class 10 Maths Chapter 8 Coordinate Geometry Exercise 8.3 Ex 8.3 Question 1. Evaluate : (i) sin 18°/cos 72°         (ii) tan 26°/cot 64°       (iii)  cos 48° – sin 42°       (iv)  cosec 31° – sec… Read More »NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry (Exercise – 8.3) ## NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry (Exercise – 8.2)

NCERT solutions for class 10 Maths Chapter 8 Coordinate Geometry Exercise 8.2 Ex 8.2 Question 1.  Evaluate the following: (i) sin 60° cos 30° + sin 30° cos 60° (ii) 2 tan2 45° + cos2 30° – sin2 60 Solution : (i) sin 60° cos 30° + sin… Read More »NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry (Exercise – 8.2) ## NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry (Exercise – 8.1)

NCERT solutions for class 10 Maths Chapter 8 Coordinate Geometry Exercise 8.1 Ex 8.1 Question 1.  In ∆ ABC, right-angled at B, AB = 24 cm, BC = 7 cm. Determine: (i) sin A, cos A (ii) sin C, cos C Solution: In a ΔABC,… Read More »NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry (Exercise – 8.1) ## NCERT solutions for class 10 Maths chapter 7 Coordinate Geometry (Exercise 7.4)

NCERT solutions for class 10 Maths Chapter 7 Coordinate Geometry Exercise 7.4 Ex 7.4 Question 1.  Determine the ratio in which the line 2x + y – 4 = 0 divides the line segment joining the points A(2, –2) and B(3, 7). Solution:  Ex 7.4… Read More »NCERT solutions for class 10 Maths chapter 7 Coordinate Geometry (Exercise 7.4) ## NCERT solutions for class 10 Maths chapter 7 Coordinate Geometry (Exercise 7.3)

NCERT solutions for class 10 Maths Chapter 7 Coordinate Geometry Exercise 7.3 Ex 7.3 Question 1. Find the area of the triangle whose vertices are: (i) (2, 3), (-1, 0), (2, -4) (ii) (-5, -1), (3, -5), (5, 2) Solution: Ex 7.3 Question 2. In… Read More »NCERT solutions for class 10 Maths chapter 7 Coordinate Geometry (Exercise 7.3)

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