Jawabanmu

2014-06-02T20:29:06+07:00
A = 80 m, l = 10 m
A = p . l
80 = p . 10
p = 8 m

K = 2 (p + l)
   = 2 (8 + 10)
   = 36 m
2014-06-02T20:30:37+07:00
L = p . l
80 m2 = 10 m . l
l = 80 : 10
= 8 m
K = 2 ( p + l) 
= 2 ( 10 + 8 )
= 2 . 18
= 36 m