Class 8 Mathematics – Quadrilaterals 1. Introduction A quadrilateral is a polygon with four sides and four angles. The sum of all interior angles of a quadrilateral is always 360°. Quadrilaterals...
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 Science – Coal and Petroleum: Fossil Fuels 1. Introduction Fossil fuels are non-renewable energy sources formed from the remains of ancient plants and animals over millions of years. Main...
Class 8 Science – Microorganisms: Friend and Foe 1. Introduction Microorganisms (microbes) are tiny living organisms not visible to the eye. Found everywhere: air, water, soil, humans,...