Jawabanmu

2014-05-05T15:24:46+07:00
K = 2p + 2l
k = 2.3 + 2l
k = 6 + 2l
18 = 6 + 2l
18-6 = 2l
12 = 2l
12 : 2 = l
6 = l

luas = p x l
luas = 3 x 6
luas = 18
1 5 1
2014-05-05T15:24:51+07:00
P=2l-3
k=18
18=2p+2l
18=2(2l-3)+2l
18=4l-6+2l
18+6=6l
24=6l
l=4
p=5
luas= p*l
luas=4*5= 20