As shown in the figure, in the isosceles right triangle ABC, ∠ ACB = 90 °, ad is the middle line on the waist CB, CE ⊥ ad intersects AB with E

As shown in the figure, in the isosceles right triangle ABC, ∠ ACB = 90 °, ad is the middle line on the waist CB, CE ⊥ ad intersects AB with E

As shown in the figure, the \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\cgin △ bed =BE∠GCD=∠BCD=BD,∴△CGD≌△BED(SAS),∴∠CDA=∠EDB.