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L = ½ DG × GE
64 = ½ × 8 × GE
GE = 16 cm
∆DEF
DG² = GE × GF
8² = 16 × GF
GF = 4 cm
DF² = FG × FE
DG² = 4 × 20
DG = √80 cm ← jwb