6 Brenda is designing a cylindrical tin can for a canned fruit company. The cans must have capacity 1 litre, and they must use as little metal as possible. 1000 7T1'2 a Explain why the height h is given by h = cm. I: Show that the total surface area A is given by 2000 2 A=21rr2+ cm . ,. c Find the dimensions of the can which make A as small as possible