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20 17 Hongqiao senior high school entrance examination is a model of mathematics
As shown in the figure: connect a' b? Building BF⊥A`E DG⊥AC

∵A`E⊥AC ∴ ∠AED=45

D is the midpoint of AB.

∴DG = ge = BC/2 = 3 AE = a ` e = ag+ge = 4+3 = 7

a ` f = a ` e-BC = 1 FB = EC = 1

A`B= √2