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Gunakan konsep luas :
a1 x t1 = a2 x t2
(a = alas, t = tinggi)
sama artinya
DQ x FB = DP x QM
(1/2 x 6√2 x 6) = 3√6 x QM
18√2 = 3√6 QM
QM = 18√2 / 3√6
QM = 6/√3
rationalize, get
QM = 2√3