IF A square paper of side 25 cm is rolled to form a cylinder , then its curved surface area is-
height/length of the cylinder = 25cm
if it is rolled it's side becomes it's circumference
i.e.25 cm=2*pie*r
curved surface area of cylinder=2*pie*r*h
=25*25
=625cm2
if it is rolled it's side becomes it's circumference
i.e.25 cm=2*pie*r
curved surface area of cylinder=2*pie*r*h
=25*25
=625cm2