Practise the method.Example 1A cylinder has radius 8cm and height 8cm. Find its curved surface area only. Write the answer as kπcm2 and enter k.Show worked answerAnswer: 128Curved area = circumference × height =2πrh=128π.No circular end faces are included. The coefficient is 128.Example 2A cylinder has radius 2cm and height 8cm. Find its total surface area with one circular base and an open top. Write the answer as kπcm2 and enter k.Show worked answerAnswer: 36Curved area = circumference × height =2πrh=32π.Include one base of area 4π. The coefficient is 36.Example 3A cylinder has radius 8cm and height 9cm. Find its total surface area including both circular ends. Write the answer as kπcm2 and enter k.Show worked answerAnswer: 272Curved area = circumference × height =2πrh=144π.Include two ends of total area 128π. The coefficient is 272.