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= 22/7×14
= 22×2
= 44 cm
(b) k = 2πr
= 2×22/7×21
= 2×22×3
= 44×3
= 132 cm
2. (a) k = πd
= 3,14×20
= 31,4×2
= 62,8 cm
(b) k = 2πr
= 2×3,14×20
= 62,8×2
= 125,6 cm