Jawabanmu

2014-04-21T21:48:48+07:00
Lp = 2πr (r + t)
    =  2 x 
 \frac{22}{7} x 7 ( 7+18)       
    = 44 x 25
    = 1100 cm
³
2014-04-21T22:19:21+07:00
Lp = 2 x 22/7 x 7 (7 + 18)
     = 44 x 25
     = 1100 cm