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847,8m = 8478 cm
maka keliling roda
8478 ÷ 900 = 9,42 cm
jari" lingkaran
K = π ×d
9,42 = 3,14 × d
3 cm = d
maka :
r = d ÷ 2
r = 3 ÷ 2
r = 1,5 cm