Class 8 Science – Sound: Production and Propagation 1. Introduction Sound is a form of energy that produces a sensation of hearing. It is produced when an object vibrates and creates...
Question: In a cyclic quadrilateral ABCD, AB = 4, BC= 5, CD = 9 and DA = 5. Find the length of the diagonal AC. (1) 8 (2) 7 (3) 6 (4) √61. Solution: AC*BD = 36+25 = 61 AC/BD = 20+45/...
Class 8 Mathematics – Direct and Inverse Proportions 1. Introduction Proportion shows how two quantities are related to each other. Helps in solving real-life problems in speed, distance,...
1. Introduction Square of a number: The product of a number multiplied by itself. Square root of a number: The value which, when multiplied by itself, gives the original number. Key Concept: Squaring...