1.

Find the circumference of the circles with the following radius: (Take `22/7`) (a) `14cm` (b) `28mm` (c) `21cm`

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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