Find the circumference of the circular of the following radius (pie is equal to 22 upon 7)
first 21 CM second 28 mm
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(i) radius=21cm
circumference=2πr
=2×22/7×21=66cm
(ii) radius=28cm
circumference=2πr
=2×22/7×28=88cm
circumference=2πr
=2×22/7×21=66cm
(ii) radius=28cm
circumference=2πr
=2×22/7×28=88cm
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