Question

The radii of two cylinders are in the ratio 2:3 and their heights are in the ratio
5:3. Calculate the ratio of their curved surface areas.
​

Answer 1

Answer:

let the radii of the two cylinder are r and R

their heights are h and H

so their curved surfaces are 2πrh and 2πRH

the ratio if their curved surfaces

2πrh:2πRH

=2π rh/2πRH

=r/R.h/H

=2/3.5/3

=10/9

=10:9

Answer 2

Answer:

1st cylinder's curved surface area = 62.8 sq.units

2nd cylinder's curved surface area= 84.78 sq.units

Step-by-step explanation:

r1=2, h1=5

curved surface area of 1st cylinder= πr^2h

=3.14×2^2×5

=3.14×4×5

=3.14×20

=62.8 sq. units

r2=3, h2=3

curved surface area of 2nd cylinder= πr^2h

=3.14×3^2×3

=3.14×9×3

=3.14×27

=84.78 sq.units

hope it helped

mark as brainliest ✌️