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a. kliling sepeda= 105.600.000 / 400 =264.000cm
b. 2nr = 264.000cm
r = 264.000 / (2nr)
r = 264.000 / (2x22/7)
r = 264.000 x 7/44
r=42.000cm
b. K = 2 πr
r = 2. K/π
= 2 x 2,64 /3,14
= 1,68 meter = 168 cm