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jarak = Kel x 500
706,5 m = 3,14 x d x 500
706,5 m = 1570 x d
d = 0,45m
= 45 cm
r = 1/2 x d
= 22,5 cm
b) Kel.roda = pi x d
= 3,14 x 45 = 141,3 cm