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    				| 1. | 
                                    The large hand of a clock Is 42 cm long. How many centi-metres does its extremity move in 20 minutes? | 
                            
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Answer»  For 20 minutes = θ = 4 x 30° = 120° We know that l = r × θ l = 42 x 120 x π/180 = 28 x 22/7 = 88 Therefore, the length is equal to 88 cm.  | 
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