Question

1. The height and the radius of the base of a
cylinder are in the ratio 3 : 1. If its volume
is1029 r1 cm, find its total surface area.​

Answer 1

Answer:

Let height =3x, radius=1x

Volume of cylinder =πr

2

h=1029π

⇒x

2

.3x=1029

⇒3.x

3

=1029

⇒x=7

Height =21, radius =7

Total surface area =2πr(r+h)cm

2

=2π(7)(7+21)=1232cm

2