Question

Dik : Volume Balok 1440 cm3
panjang = 15 cm
tinggi = 8 cm
dit : L

Answer 1

V = p x l x t
1440 = 15 x l x 8
1440 = 120 x l
l = 1440/120 = 12 cm

Lp = (2xpxl) + (2xpxt) + (2xlxt)
Lp = (2x15x12) + (2x15x8) + (2x12x8)
Lp = 360 + 240 + 192
Lp = 792 cm^2

Answer 2

Cari dulu lebarnya
Lebar = Volume : ( Panjang x Tinggi )
Lebar = 1440 : ( 15 x 8 )
Lebar = 1440 : 120
Lebar = 12 cm
Maka
Lp = ( 2 x p x l ) + ( 2 x p x t ) + ( 2 x l x t )
Lp = ( 2 x 15 x 12 ) + ( 2 x 15 x 8 ) + ( 2 x 12 x 8 )
Lp = 360 + 240 + 192
Lp = 792 cm²