Chapter – 7 : Triangles Exercise 1 Question 1: In quadrilateral PQRS, PR = PQ and PQ bisects (look at the fig.). Show that the . What can you say about QR and QS? Solution: In and , we have PR = PS (PQ bisects ) PQ = PQ (common) (By SAS congruence) Hence […]
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Posts in category Class 9
Statistics
Chapter-14: Statistics Exercise 1 Q1) Give 5 scenarios of day to day life from which any type of data can be collected. Solution: Daily life activities from where data can be collected are as follows: (i) Daily household expenditure (ii) Rainfall happening in your area (iii) Electricity bill of monthly (iv) Voting results or […]
Number Systems
Chapter-1: Number systems 1) Prove that zero as a rational number. Write zero in p/q, where p and q are integers and q ≠ 0? Answer: Yes. Zero is a rational number and it can be represented as . 2) In between 3 and 4, find six rational numbers. Answer: There are an infinite number of rational numbers between the numbers […]
Quadrilaterals
Chapter – 8 : Quadrilaterals Q1. The angles of quadrilateral are in the ratio . Find the angles of the quadrilateral. Solution: Let the common ratio between the angles be x. We know that the ‘Sum of the interior angles of the quadrilateral’ = Now, Therefore the Angles of the quadrilateral are: Q2. […]
Coordinate Geometry
Chapter- 3: Coordinate Geometry Exercise 1 Q1. How will you describe the position of a mobile phone kept on the study table to another person? Solution: For describing the position of a mobile phone kept on the study table, we take two lines, a perpendicular and a horizontal line. Considering the table as a […]
Polynomials
Chapter-2 : Polynomials Exercise – 1 Q.1.Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer: (i) Answer: It is a polynomial in one variable. (ii) Answer: It is a polynomial in one variable. (iii) Answer: It is not a polynomial since the […]
Sound
Chapter-12: Sound Que.1. When an object vibrates in a medium, it produces sound which reaches our ear. Explain how it is done. Ans. Sound propagates through air which is a medium. When the prongs of a tuning fork vibrate, they disturb the air molecules in the surrounding. When it moves forward, the molecules in […]
Introduction to Euclid’s Geomet...
Chapter-5: Introduction to Euclid’s Geometry Exercise 5:1 Question 1 : State true or false for the following statements mentioned below with the reason: a: Through a single point only one line can be passed. b: Through two distinct lines there are infinite number of lines that can be passed. c: A line that is […]