Jawabanmu

2014-02-06T19:03:49+07:00
132/2 = 66
r = 66 cm 
luas = 3.14 × 66 × 66 
13677.84 cm²
1 1 1
2014-02-06T19:05:24+07:00
Π = 22 ÷ 7
jari jari lingkaran = 21 cm.
L =22 X 21 X 21 ÷ 7
   = 22 X 21 X 3
   = 1.386 cm²