As shown in the figure, in rectangular paper ABCD, fold it as shown in the figure, and the crease is EF. If the angle EFB = 65 degrees, calculate the degree of angle AED Picture:

Angle AED = 45 degrees

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11. As shown in the figure, fold one corner of triangle paper ABC, and the crease is EF. If ∠ a = 80 °, B = 68 ° and CFE = 78 °, calculate the degree of ∠ CEF
12. As shown in the figure, after folding one side DC of isosceles trapezoid ABCD along EF, make points D and C fall at d ', C', respectively. If ∠ BFC '= 20, then ∠ EFB has more degrees
13. As shown in the figure, there is rectangular paper ABCD, ab = 6, BC = 8, fold the paper along EF, make point B and point d coincide, and calculate the length of crease EF
14. As shown in the figure, fold the rectangular piece of paper ABCD so that point a coincides with point C, the crease is EF, and ∠ BFC = 65 °, then ∠ bec=
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