Keliling
K = ½ × π × d
K = ½ × 22/7 × 42
K = ½ × 22 × 6
K = ½ × 132
K = 66 m
2 kali putaran
66 × 2
= 132 putaran
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Keliling
K = ½ × π × d
K = ½ × 22/7 × 42
K = ½ × 22 × 6
K = ½ × 132
K = 66 m
2 kali putaran
66 × 2
= 132 putaran