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原帖由 ehbb 於 2020-11-3 06:28 PM 發表 known: 1. DE = FG = k 2. AC = 5 (pyth thm) 3. shortest distance from B to AC thus height of triangle BDG = (a) - k let DG = EF = y, Area of DEFG = ky let AE = x, then FC = 5-x-y AND, Area D ...