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= 5.280 cm
Keliling = Jarak : Banyak putaran
= 5.280 cm : 40
= 132 cm
K = 2 × π × r
132 = 2 × 22/7 × r
132 = 44/7 × r
r = 132 × 7/44
r = 3 × 7
r = 21
Jadi jari-jari roda adalah 21 cm.
K = 2. 22/7 . r = 132
44/7. r = 132
r = 132 . 7/44
r= 21 cm