Jawabanmu

2014-05-16T20:32:17+07:00
Lp = 4 π
     = 4x 22/7 x 7 x7
     = 4 x 154
     = 616 cm2
2014-05-16T20:36:07+07:00
Lp = 4 x π x r²
     = 4x 22/7 x 7 x7
     = 4 x 154
     = 616 cm
²