Jawabanmu

2013-12-16T19:26:03+07:00
Pxlxt= p:l:t = 3:2:4
Diket : p= 15 cm
Tanya : L= ?
Jawab : 15/3 = 5
p= 3x5 = 15
           
l= 2x5= 10
          
 t= 4x5= 20


 L= p.l.t  = 15x10x20 =3000

Jadi, luas balok = 3000cm2



2013-12-16T19:37:21+07:00
Lp= 2(p.l) + 2(l.t) + 2(p.t)
=2(15.10) + 2(10.20) + 2 (15.20)
=2x150 + 2x200 + 2x300
=300 + 400 + 600
=1300 cm2

klo tdk slh..