Jawabanmu

2014-03-03T17:17:25+07:00
5000 kali berputar = 6,28 km = 6280 m = 628000 cm
1 putaran = 125,6 cm

1 putaran = 1 keliling lingkaran
K = 2 π r
125,6 = 2 3,14 r
r = 20 cm
2014-03-03T17:24:24+07:00
Banyak putaran = 5000
lintasan yang dilalui = 6,28 km = 6280 m
keliling = 6280/5000
           =  1,256 m
           = 1256 cm
keliling = π.2r
1256 = 3,14 x 2 x r
2r = 1256/3,14
2r = 400
r = 200 cm