tolong dijawab sama caranya ya

11.
330000 cm : 5.000 putaran = 66 cm
keliling = 2 phi r
66 = 2 * 22/7 r
44/7 r = 66
r = 10,5 cm

12.
keliling = phi d
= 22/7 * 63
= 198 m

= 1188 : 198
= 6 kali putaran