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DQ = (a√2)/2
HD = a
DQ² + HD² = HQ²
((a√2)/2)² + a² = 72
a = 4√3
RUMUS CEPAT = R/3 √3 ket. R = panjang rusuk
Jarak bidang BGE ke bidang ACH = R/3 √3
= (4√3)/3 √3
= 4 cm