Jawabanmu

2013-12-10T15:33:06+07:00
2013-12-10T16:00:22+07:00
Diket: R: 30 -----> r : 15
             jadi vhi : 3,14
dit luas ....cm2?
jwb : luas : 3.14 x15 x15 :706.5 cm2