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Practice of different subjects in senior high school entrance examination
It can be proved that the length relationship after folding is CG=DB.

AG=AD

And ∠BAD=∠CAG

And ∠ ACG = ∠ Abd = ∠ ACB = 90 degrees.

It can prove the age of △ ade △.

△GEC is a right triangle.

And CG? +CE？ = ge?

Namely: BD? +CE？ =DE？

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