Jawabanmu

2014-01-16T14:56:19+07:00
1320 = 2.  \pi . r x 1000

132 = 2 .  \frac{22}{7} . r  x 100

66 =  \frac{22}{7} . r x 100

21 = 100r

r = 0,21 meter --> 21 cm