Tolong nomor 17 dan 18. Makasih

17.
a x c = 108
c = 108/a

b x c = 54
b × 108/a = 54
108b = 54a
a = 2b

a x b = 72
2b x b = 72
b^2 = 36
b = 6 cm

a = 2.6 = 12 cm

c = 108/12 = 9 cm

Sisi sisi = 12 cm, 6 cm, 9 cm
Volume = 12 × 6 × 9 = 648 cm3

18.
luas bidang = akar 162 = 9 akar 2

luas bidang diagonal
sisi x sisi akar 2
s^2 akar 2 = 9 akar 2
s = 3

panjang rusuk = 3 cm
luas sisi kubus = 6 × 3 × 3 = 54 cm2