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K = 5280/40 = 132 cm
K = 2πr
132 = 2 x 22/7 x r
132 = 44/7 x r
r = 132 x 7/44
r = 21 cm
= 5.280 cm
Banyak Putaran = 40
K = Jarak : Banyak Putaran
= 5.280 cm : 40
= 132 cm
K = 2 × π × ×r
132 = 2 × 22/7 × r
r = 132 × 7/22 : 2
r = 6 × 7 : 2
r = 42 : 2
r = 21
Jadi jari-jari roda tersebut adalah 21 cm.