Ainunlaras
Luas permukaan kubus = 6.rusuk² 864 cm² = 6 r² 144 cm² = r² 12 cm = rusuk misal = r : p 3x : 4x r = 3x 12 = 3x 4 = x panjang = 4x = 4(4) =16 cm lebar = 3x = 3(4) = 12 cm tinggi = 2x = 2(4) = 8 cm luas permukaan balok = 2(p×l)+2(p×t)+2(l×t) =2(16×12)+2(16×8)+2(12×8) =384+256+192 =832 cm²
864 cm² = 6 r²
144 cm² = r²
12 cm = rusuk
misal = r : p
3x : 4x
r = 3x
12 = 3x
4 = x
panjang = 4x = 4(4) =16 cm
lebar = 3x = 3(4) = 12 cm
tinggi = 2x = 2(4) = 8 cm
luas permukaan balok = 2(p×l)+2(p×t)+2(l×t)
=2(16×12)+2(16×8)+2(12×8)
=384+256+192
=832 cm²