01 Mathematics (Maths) Class 9

Q1: Find the value of k, if x = 2, y = 1 is a solution of the equation 2x […]

Q1: If the points A(x, y), B(3, 6) and C(-3, 4) are collinear, show that x – 3y + 15

Question 1. Factorise:  Solution:     Thus,     Question 2. Factorise: (x6 – y6)Solution: x6 – y6 = (x3)2 – (y3)2 = (x3 – y3)(x3 + y3)  [∵ a2 –

Q1.Simplify the following expressions: (i) (4 + √7) (3 + √2)(ii) (√5 – √3)2(iii) (√5 -2)( √3 – √5) Sol. 

Question 1. Find the mean of: 10, 90, 20, 80, 30 and 70. Solution: Number of observations = 6 Sum of the

Q1. If the circumference of the base of a right circular cylinder is 110 cm, then find its base area. Solution: Let

Q1. Find the area of a triangle whose sides are 8 cm, 10 cm, and 12 cm. Sol: Let the

Question 1. The diameter of circle is 3.8 cm. Find the length of its radius. Solution: Since, the diameter of circle is

Q1: In the adjoining figure, if ∠ B = 68°, then find ∠ A, ∠ C and ∠ D.  Solution: Because

Q1: In the given figure, AD = BC and BD = AC, prove that ∠DAB = ∠CBAAns:In ∆DAB and ∆CBA,