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4 : 9
luas permukaan abcd = 6 . s^2
864 = 6. s^2
864 = 6. 4x. 4x
864 = 6. 16x
864 = 96x
x = 9
panjang rusuk abcd.efgh = 4x =4.9 = 36
a. panjang rusuk klmn.opqr = 9x = 9.9 = 81 cm
b volume kubus abc.defg = s^3 = 36^3 = 46656
a. LP abcd.efgh = 6s kuadrat
864=6s kuadrat
s kuadrat = 864:6
s= akar 144
s(rusuk)= 12
perbandingan
4:9=12:n
n= 12:4x9
n(rusuk klmn.opqr)= 27
b.
volume = s pangkat tiga
=12 pangkat tiga
=hitung sendiri deh hihi