Jawabanmu

2014-05-08T15:04:33+07:00
L Permukaan = L alas * 2 + L sisi 1 + L sisi 2 + L sisi 3
= 6*8/2*2 + 8*15 + 10*15 + 6*15
= 48 + 120 + 150 + 90
= 408cm^2 (a)
2014-05-08T15:05:21+07:00
Lper=2*(La)+3*(Lsisitegak)
      =2*(1/2*8cm*6cm)+3*(8cm*15cm)
     =2*24cm2+3*120cm2
     =48cm2+360cm2
     =408cm2(a)