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r = 21 cm
π = 22/7
Dijawab :
K = 2πr
= 2 . 22/7 . 21
= 2 . 66
= 132 cm
Jadi, keliling lingkaran tersebut adalah 132 cm.
= 2 × 21 cm
= 42 cm
K = π × d
= 22/7 × 42 cm
= 22 × 6 cm
= 132 cm