Jawabanmu

2014-03-29T05:52:06+07:00
Diameter : 20 cm Jari-jari : 10 cm Luas = 3,14 x 10 x 10 = 314 cm2
4 3 4
2014-03-29T05:52:28+07:00
Πr² = 3,14 x 6 x 6 = 3,14 x 36 = 113,04 cm