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= 6 akar 2 x 6
= 36 akar 2
jika seluruh bidang diagonal pada kubus maka,
= 6 x 36 akar 2
= 216 akar 2
= sisi x diagonal ruang
Untuk panjang
diagonal bidang = s√2
diagonal ruang = s√3
Maka,
= 6 x 6√2
= 36√2 cm²