Question

what is the volume of a cylinder whose r:h -2:3 and sum of radius and height is 15cm​

Answer 1

Here,

r:h= 2:3

r+h = 15cm

let,

r= 2x, h= 3x

ATQ,

2x+3x=15

=> 5x= 15

=>x= 15/5 = 3

then,

r= 2×3=6cm

h= 3×3=9cm

The volume of the cylinder = πr²h

=> v= 22/7×(6)²×9

=>v= 22/7× 36 × 9

=>v = 1018.28cm³

Therefore volume of the cylinder is 1018.28cm³.