**The capacity of a closed cylindrical vessel of height 1 m is 15.4 litres. How many square metres of metal sheet would be needed to make it?**

**Solution:**

Let radius of closed cylindrical vessel

Height of closed cylindrical vessel m **= **100 cm

Capacity of closed cylindrical vessel litres

1 litre

15.4 litres

Therefore, Volume of closed cylindrical vessel

**cm**

Total Surface Area of closed cylindrical vessel

=**0.4708**

Therefore, 0.4708 of sheet is required to make given closed cylindrical vessel.