Jawabanmu

2014-02-21T12:29:26+07:00
22/7 x 14 x 14 = 616 
616... phi X r2 = 22/7 X 14 X 14 = 616
Komentar sudah dihapus
2014-02-21T12:36:30+07:00
L = phi x r x r
   = 22/7 x 14 cm x 14 cm
   = 4312 ÷ 7
    =616 cm²
atau
L = 1/4 x phi x d²
   = 1/4 x 22/7 x 28² cm
   = 616 cm²
1 1 1