Choosen As Best Answer

△GDE ~ △BCE (AA相似)
GD : BC = DE : CE
GD : 5a = 2 : 3 => GD = 10/3 a => AG = 5a + 10/3 a = 25/3 a

△AGP ~ △FBP (AA相似)
AG : BF = AP : FP
25/3 a : 4a = 25 : 12 = AP : FP

Balm of Gilead

忘了放圖

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