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= √45+45
= √90 = 3√10
b.L = 6s²
= 6*(3√5)²
= 270
c.diagonal sisi = √(3√5)²+(3√5)²+(3√5)²
= √45+45+45
= √135
= 3√15
d.v = s³
= (3√5)³
= 135√5