Question

Find the diameter of base of cylinder, if its height is 1.2 metre and its curved surface area is 31680 square centimetre.​

Answer 1

Answer:

Given: Diameter of base of cylinder =14 cm.

∴ Radius (r)=

2

14

=7 cm.

and Height of cylinder is h=20 cm.

So, Surface area of cylinder =2πr(r+h)

=2×

7

22

×7(7+20)

=44×27

Surface area of cylinder =1188 sq.cm.

Volume of cylinder =πr

2

h

=

7

22

×7

2

×20

=22×7×20

Volume of cylinder=3080 cu.cm

Answer 2

Answer:

3080 cu.cm

Step-by-step explanation:

hope it will be helpful