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Mathematics quadrilateral of senior high school entrance examination
F is the midpoint of AD,

∴DF=? .

CE = again? BC,

∴DF=CE and df∑ce,

∴ Quadrilateral CEDF is a parallelogram;

(2) Analysis

As shown in the figure, DH⊥BE at point H.

Are you online? In ABCD, ∫∠b = 60,

∴∠DCE=60。

AB = 4,

∴CD=AB=4,

∴CH=2,DH=2? .

Are you online? In CEDF, CE=DF=? AD=3, then eh = 1.

∴ in Rt△DHE, do you know DE= according to Pythagorean theorem? =? .