A rectangular paper of length l and breadth h is wrapped around a cylindrical can of radius r and height h.
S1 : The length of rectangular sheet required equals circumference of circle
S2 : The area of rectangular sheet required = 2πrh
S1 and S2 are true
Upon wrapping a cylinder, the curved surface is a circle. Since the length of the rectangular sheet is the dimension being wrapped, the length of the cylinder equals the circumference of the circle. Therefore area of rectangular sheet required equals l × b = 2πrh