Jawabanmu

2014-08-27T20:14:51+07:00
3,14 x (4,5x4,5)
= 3,14 x 20,25
= 63,585cm
1 5 1
2014-08-27T20:31:38+07:00
Luas = phi r^2
        = 3,14 * 20,25
       = 63,585 cm
1 5 1