Jawabanmu

2014-06-12T07:57:21+07:00
60/360 = x/132
1/6 = x/132
132 = 6x
x= 22
panjang busur = 22 cm
2014-06-12T07:59:43+07:00
K= 2 x 22/7 x 21
  = 2 x 22 x 3
  = 2 x 66
  = 132
 
panjang busur = 60/360 x 132
                     = 1/6 x 132
                     = 132/6
                     = 22