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mungkin kubus
panjang = 2 satuan panjang
lebar = 2 satuan panjang
tinggi = 2 satuan panjang
AH = diagonal bidang
diagonal bidang = √s² + s²
= √2² + 2²
= √4 + 4
= √8
= √4.√2
= 2√2 satuan panjang