Class 9 Practice Set 4.2 Lecture 1 Ratio and Proportion Chapter 4| Std 9th Maths 1 | Algebra 4.2
This Video explains Practice Set 4.2 Class 9 of Chapter 4 Ratio and Proportion of Standard 9 for Geometry Maharashtra State Board. #Std9 #Maharashtra #SSC #Class9 9th Maths-2 Geometry Playlist all topics - • 9th Standard Geometry Maharashtra State Bo... 9th Maths-1 Algebra Playlist all topics - • 9th Standard Algebra Maharashtra State Boa... Following questions of Maharashtra State Board Practice Set 4.2 Class 9 of Chapter 4 Ratio and Proportion of Standard 9 have been explained in the video: Question 1.Using the property 𝑎/𝑏 = 𝑎𝑘/𝑏𝑘, fill in the blanks by substituting proper numbers in the following. (i) 5/7 = …./28 = 35/… = ..../3.5 (ii) 9/14 = 4.5/ ….= …./42 = …./3.5 Question 2. Find the following ratios. i. The ratio of radius to circumference of the circle. ii. The ratio of circumference of circle with radius r to its area. iii. The ratio of diagonal of a square to its side, if the length of side is 7 cm. iv. The lengths of sides of a rectangle are 5 cm and 3.5 cm. Find the ratio of numbers denoting its perimeter to area. Question 3. Compare the following (i) √5/3, 3/√7 (ii) 3√5/5√7, √63/√125 (iii) 5/18, 17/121 (iv) √80/√48, √45/√27 (v) 9.2/5.1, 3.4/7.1 Question 4. Solve. (i) ABCD is a parallelogram. The ratio of ∠A and ∠B of this parallelogram is 5 : 4. Find the measure of ∠B. (ii) The ratio of present ages of Albert and Salim is 5 : 9. Five years hence ratio of their ages will be 3 : 5. Find their present ages. (iii) The ratio of length and breadth of a rectangle is 3 : 1, and its perimeter is 36 cm. Find the length and breadth of the rectangle. (iv) The ratio of two numbers is 31 : 23 and their sum is 216. Find these numbers. (v) If the product of two numbers is 360 and their ratio is 10 : 9, then find the numbers. Question 5. If a : b = 3 : 1 and b : c = 5 : 1, then find the value of 1. (a³/15b²c)³ 2. a²/ 7bc Ratio and Proportion 9th Class Practice Set 4.1 Question 6. If √(0.04×0.4×𝑎) = 0.4×0.04× √ 𝑏, then find the ratio 𝑎/𝑏 9th Algebra Practice Set 4.2 Question 7. (x + 3) : (x + 11) = (x – 2) : (x + 1), then find the value of x.
