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banyak putaran = 80 kali
jarak y ditempuh = 400 meter = 40.000 cm
jadi :
K = 40.000/80
= 500 cm
jadi :
K = 2 x 3,14 x r
500 = 6,28 x r
r = 500/6,28
r = 79,6 cm
K = 40000/80 = 500 cm
Maka;
K = 2πr
500 = 2 x 3,14 x r
500 = 6,28 x r
r = 79,6 cm