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    				| 1. | 
                                    A cylinder has height 20 cm and base radius 4 cm. Then find its volume. | 
                            
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Answer»  When the square of the radius is multiplied by π we get the area of the circle. Base area of the cylinder = π × 42 = 16 π cm2 The height of the cylinder is 20 cm Volume = 16 π × 20 = 320 π cm3  | 
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