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Diagonal ruang= s√3
√27= 3s²
s²≡ 27 :3
s²=9
s=3 cm
Jadi,semua rusuk kubus PQRS.TUVW panjangnya 3 cm
Luas SQUW= Panjang SQ x UQ
= √3²+3² x 3
= 3√2 x 3
= 9√2 (b)
3s² = 27
s² = 9
s = √9 = 3
diagonal sisi² = s²+s²
x² = 3²+3²
x² = 9+9
x² = 18
x = √18
x = 3√2
L = 3*3√2 = 9√2 (b)