jawabannya apa? tolong dijawab:)

3,3 km = 330.000 cm
K = 330.000 / 5000
= 66 cm

2phie r = 66
2 × 22/7 × r = 66
44/7 × r = 66
r = 66 × 7/44
r = 6 × 7/4
r = 3 × 7/2
r = 21/2
r = 10,5 cm ( A )

semoga membantu......