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Panjang diagonal ruang = s√3= 8√3 cm
Pembuktian
diagonal bidang = √8²+8²
= √64+64
= √128
= √64 . √2
= 8√2
diagonal ruang = √8²+8²+8²
= √64+64+64
= √192
= √64 . √3
= 8√3