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√75 = s√3
√75 :√3 =s
√25 = s
5 = s
luas sisi kubus = 6s²
maka
6 x 5²
6 x 25
150 cm² (c)
√75 = s√3
√25.3 = s√3
5√3 = s√3
s = 5 cm
jadi, L sisi kubus = 6.s² = 6.5² = 6.25 = 150 cm²(C)