在△ABC中,∠ACB为锐角,点D为射线BC上一点,连结AD,以AD为一边且在AD的右侧作正方形ADEF.

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  • 证明CF⊥BD且CF=BD,可以通过证明△ABD=△ACF△ABC中,AB=AC,∠BAC=90°正方形ADEF中,AD=AF,∠DAF=90°∴∠BAD=∠CAF(90°共同加个∠CAD)△ABD和△ACF两者间,∵∠BAD=∠CAFAB=AC,AD=AF∴△ABD=△ACFBD=CF∵△ABD=△A...