bài $1:$cho hình vuông $ABCD$ có cạnh là $1.P,Q $lần lượt thuộc các cạnh$ AB,AD$ sao cho$ \widehat{PCQ}=45$ độ.c/m:tam giác $APQ $có chu vi bằng 2.
bài$ 2$:cho hình vuông$ ABCD$.trên$ AB$ lấy$ E$ tùy ý tia phân giác của góc $CDE $cắt $BC$ tại$ K.c/m:AE+CK=DE$

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