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    				| 1. | 
                                    A cylinder has base radius 4 cm and height 10 cm. Then find its lateral surface area. | 
                            
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Answer»  Perimeter of a circle with radius 4 cm = 2 × π × 4 = 8π cm. Curved surface area of the cylinder = Base perimeter × height = 8 π × 10 = 80 π cm2  | 
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