Jawabanmu

2014-01-28T20:42:44+07:00
Jawaban paling cerdas!
2014-01-28T21:00:42+07:00
Panjang = (3 + lebar)
keliling = 2 (panjang + lebar)
54 = 2 ((3 + lebar) +lebar )
54 = 2 (3 + 2lebar)
54 = 6 + 4 lebar
54 - 6 = 4 lebar
48 = 4 lebar
lebar = 12

panjang = 3+ lebar
= 3 + 12
= 15

Luas = panjang x lebar
= 12 x 15
= 180 m2
3 4 3