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= 5,5 km : 2500 : 22/7
= 550.000 : 2500 : 22/7
= 220 : 22/7
= 220 x 7/22
= 70 cm => diameter
jari-jari = 70 : 2
= 35 cm
K = 550.000/2.500 = 220 cm
Maka;
K = 2πr
220 = 2 x 22/7 x r
220 = 44/7 x r
r = 220 x 7/44
r = 35 cm