Question

1)-The radii of two cylinders are in the ratio 2 : 3 and their heights are in the ratio 5 : 3. The ratio of their volumes is a) 10 : 17 b) 17 : 27 c) 20 : 27 d) 20 : 37 b)-The surface area of a sphere is 616 cm2 . Then its radius is a) 7 cm b) 14 cm c) 3.5 cm d) 21 cm

Answer 1

Answer:

Let the radii of the base be 2r and 3r, heights as 5h and 3h, respectively

∴ Ratio of their volumes =π(2r)

2

×5h:π(3r)

2

×3h=20:27

Answer 2

Answer:

answer : volume= 20: 27 and surface area= 10: 9

Step-by-step explanation:

let the radius be 2x and 3x

let the height be 5y and 3y

Ratio of their volume = r²h/ R²h

= 2x²×5y/ 3x²×3y

= 20/27

find surface area by your self