CBSE Class 9 Sample Papers, Syllabus, Test Papers & NCERT Solutions

Q1. What is a quadrilateral? Answer: A quadrilateral is a plane figure formed by four distinct vertices and four line segments joining them in order, such that every point other than the vertices lies on exactly one of the four segments. Q2. What are the vertices, sides, diagonals, and angles of a quadrilateral ABCD? Answer: […]

Q1. What is an algorithm? Answer: An algorithm is a systematic, step-by-step procedure used to solve a problem and arrive at an answer. Each step should be described as precisely as possible. Q2. What is the main advantage of using an algorithm for addition? Answer: An algorithm makes addition much faster than counting objects individually. […]

1. What is a weighted average? Answer: A weighted average is an average in which each value is multiplied by its corresponding weight. It is used when different values have different levels of importance or contribute different amounts to the total. 2. What is the formula for calculating a weighted average? Answer: The formula for […]

Chapter 9 – Propositions and their Converses Chapter 10 – How Quantities Combine: Understanding Data Chapter 11 – The World of Algorithms Chapter 12 – Quadrilaterals Chapter 13 – Two Variables, One Line Chapter 14 – Math of Space: Surface Area and Volume

Q1. What is a proposition? Answer: A proposition is a statement that is either true or false. For example, “If it rains, then the road is wet” is a proposition. Q2. What is the converse of a proposition? Answer: The converse of a proposition “If X, then Y” is “If Y, then X.” The conditions […]