पृथ्वी का आंतरिक भाग पृथ्वी की आकृति लध्वक्ष गोलाभ (Oblate spheroid) के समान है। यह लगभग गोलाकार है जो ध्रुवों पर थोड़ा चपटी है। पृथ्वी पर सबसे उच्चतम बिंदु माउंट एवरेस्ट है जिसकी ऊँचाई 8848 मी. है। दूसरी ओर सबसे निम्नतम बिंदु प्रशांत महासागर में स्थित मारियाना खाई है जिसकी समुद्री स्तर से गहराई 10,911 […]
Class 7 भूगोल – अध्याय-2: हमारी पृथ्वी के अंदर Read More »
सामाजिक विज्ञान (भूगोल) अध्याय-1: पर्यावरण हमारा पर्यावरण पर्यावरण हमारे जीवन का मूल आधार है। यह हमें साँस लेने के लिए, पीने के लिए जल, खाने के लिए भोजन एवं रहने के लिए भूमि प्रदान करता है। प्रत्येक जीवित जीव पर्यावरण से घिरा हुआ है। जीवों को घेरने वाले स्थान, प्रकृति या चीजें उनके पर्यावरण के
Class 7 भूगोल (Geography) – अध्याय-1: पर्यावरण Read More »
Visualizing Solid Shapes Dimensions 1D and 2D figures Example: A ray or a line segment. They have length and breadth or width. They are usually plane figures, like squares, rectangles and circles. Solid Shapes Perspectives of a Solid Shape Visualising solid shapes (ii) Cubes can be formed by placing cubes side by side. Visualising solid
Class 7 Mathematics – CHAPTER 13 : Visualizing Solid shapes Read More »
Symmetry Basics of Symmetry Symmetry in Mathematics In Mathematics, a meaning of symmetry defines that one shape is exactly like the other shape when it is moved, rotated, or flipped. Consider an example, when you are told to cut out a ‘heart’ from a piece of paper, don’t you simply fold the paper, draw one-half
Class 7 Mathematics – CHAPTER 12 : SYMMETRY Read More »
Exponents and Powers Powers and Exponents Exponent An exponent of a number, represents the number of times the number is multiplied to itself. If 8 is multiplied by itself for n times, then, it is represented as: 8 × 8 × 8 × 8 × …..n times = 8n The above expression, 8n, is said
Class 7 Mathematics – CHAPTER 11 : EXPONENTS AND POWERS Read More »
Algebraic Expressions Introduction to Algebraic Expressions Constant Constant is a quantity which has a fixed value. Terms of Expression Parts of an expression which are formed separately first and then added are known as terms. They are added to form expressions. Example: Terms 4x and 5 are added to form the expression (4x +5). Coefficient
Class 7 Mathematics – CHAPTER 10 : ALGEBRAIC EXPRESSIONS Read More »
Perimeter and Area Area of path formed =(πR2-πr2) sq units =π(R2-r2) sq units =π(R+r)(R-r) sq units 1 cm2 = 100 mm2 1 m2 = 10000 cm2 1 dm2 = 100 cm2 1 km2 = 1000000 m2 1 hectare = 10000 m2 Perimeter Perimeter is the total length or total distance covered along the boundary of
Class 7 Mathematics – CHAPTER 9 : PERIMETER AND AREA Read More »
Rational Numbers pqrq [pr]q pq rs pq (additive inverse of rs) Rational Numbers A rational number is defined as a number that can be expressed in the form pq , where p and q are integers and q≠0. In our daily lives, we use some quantities which are not whole numbers but can be expressed
Class 7 Mathematics – CHAPTER 8 : RATIONAL NUMBERS Read More »
Comparing Quantities Ratio and Proportion Percentages For example: 16%=16100 Profit and Loss Gain = (SP) – (CP) Loss = (CP) – (SP) Loss%=loss×100CP Simple Interest SI=P×R×T100 Prices related to an item (ii) Cost price Finding the profit or loss percentage Percentages Percentages are ratios expressed as a fraction of 100. Percentages are represented by the
Class 7 Mathematics – CHAPTER 7 : COMPARING QUANTITIES Read More »
THE TRIANGLE AND ITS PROPERTIES A triangle is a simple closed curve made up of three line segments. Classification of triangles: On the basis of sides: A triangle is said to be On the basis of angles: A triangle is said to be Angle sum property of a triangle: The sum of all three interior
Class 7 Mathematics – CHAPTER 6 : THE TRIANGLE AND ITS PROPERTIES Read More »
