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20 15 answer the third question of the 23rd math problem in the senior high school entrance examination in Anhui province?
Square root of 2

Angle DAB+ Angle CBA= Angle GAB+ Angle GBA=90 degrees. If the triangle GAB is an isosceles right triangle, then the triangle AEG is also an isosceles right triangle, and the similarity ratio in the second question is GA:GE=AD:EF= root number 2.

Answer by mobile phone, hope to adopt.