（1）∵ABCD是正方形，∴AB=AD，∠DAB=90°，
∵AE=BF=
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∴AF=
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∴EF=
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∴EF：AE=
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则EF：AE的值为
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（2）过E、F点作EG⊥AC于G，FH⊥AC于H，
∵S△APF=2S△APE；S△APE+S△APF=S△AEF，
∴S△APF=
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∴S△AEF=AE•AF÷2=
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∴S正方形ABCDy=S△ABC-S△AFP=
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（1）∵ABCD是正方形，| 1 |
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| 9 |
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| 54 |