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d=√8²+√8²
d=√64+√64
d=√128
d=√64×2 = 8√2 cm
atau pnjng diagonal sisi = s√2 =8√2 cm
2).Diagonal Ruang Kubus
= S√3
= 8√3 cm
3).Luas Bidang Diagonal
=S²√2
=8²√2
=64√2
4). pnjang kawat yg di buthkan:
=jumlah rusuk × sisi
=12 × 8 cm
=96 cm
maaf kalo salah, semoga membantu:)