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    				| 1. | 
                                    Find the circumference of the circles with the following radius: (Take `22/7`) (a) `14cm` (b) `28mm` (c) `21cm` | 
                            
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Answer» circumference `= 2 pi r` (a) `c= 2 xx 22/7 xx 4` `= 88 cm` (b) c`= 2 xx 22/7 xx 28` `= 176 mm` (c) c `= 2 xx 22/7 xx 21` `= 132 cm` answer  | 
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