Question

HEY!!!! answer to the above question!!!​

Answer 1

Answer:

4:1

Step-by-step explanation:

Let the radius of the original cylinder = r.

Given that radius of a cylinder is doubled.

So, the radius of new cylinder = 2r.

Given that height remains same.

Ratio of their volumes = π(2r)²h/πr²h

                                     = 4r²/r²

                                     = 4/1

                                     = 4:1

∴ Ratio of volumes = 4:1

Hope it helps!

Answer 2

Let the radius be r

Height be 1 cm

Volume of cylinder=πr²h

=22/7×r²×1

After doubling the radius

Radius =2r

Volume=πr²h

=22/7×(2r)²×1

=22/7×4r²

=88/7r²

Change in volume =88/7r²÷22/7r²

= _88_r²×7__

22 r² ×7

= 4