Pakai Caranya Yaa........

no 22.
luas permukaan kubus  = 6 x s x s = 6 x s^2
486 = 6 x s^2
486 : 6 = s^2
81 = s^2
[tex] \sqrt{81} [/tex] = s
9 = s
volume = s x s x s = 9 x 9 x 9 = 729

21. Diagonal ruang kubus = s√3 = √48
s = √48 / √3
s = √(48/3)
s = √16
s = 4 cm

volume = s³ = 4³ = 64 cm³    [C]

22. Luas Kubus = 6s²
6s² = 486
s² = 486 / 6
s² = 81
s = √81
s = 9 cm

Volume = s³ = 9³ = 729    [C]