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s = 9 cm
a. Diagonal bidang = s√2
= 9√2 cm
b. Diagonal ruang = s√3
= 9√3 cm
c. Luas permukaan = 6s²
= 6 . 9 . 9
= 486 cm²
d. Volume = s³
= 9 x 9 x 9
= 729 cm³
Itu jawabannya.