Jawabanmu

2014-05-25T17:34:31+07:00
66 m = 6600 cm
6600/50 = 132
pi . d = 132
22/7 . d = 132
d = 42 cm
2014-05-25T17:40:47+07:00
66m = 6600cm
6600/50 = 132cm (keliling roda)
132 = 22/7 xd
d = 132 x 7/22
d= 42cm