It is known that, as shown in the figure, e and F are two points on the diagonal AC of the parallelogram ABCD, AE = CF

It is proved that: (1) AF = CE and ABCD are parallelograms, AF = CB, ad ‖ BC. In △ ADF and △ CBE, AF = cead = CB, DAF = BCE, AF = CEA, ADF = CB, DAF = BCE, and ≌ ADF ≌ CBE (SAS). (2) AF = ADF ≌ CBE, DFA = bec. DF ≌ EB

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1. It is known that, as shown in the figure, e and F are two points on the diagonal AC of the parallelogram ABCD, AE = CF
2. It is known that, as shown in the figure, e and F are two points on the diagonal AC of the parallelogram ABCD, AE = CF
3. As shown in the figure, in the parallelogram ABCD, e is the midpoint of CD, and the extension line of be and ad intersects at point F Million urgent A. still have half an hour to hand in homework a. a a... will add ADD ADD ADD ADD ADD ADD ADD ADD ADD ADD ADD ADD ADD ADD ADD ADD ADD ADD
4. In the parallelogram ABCD, e is the midpoint of AD, the extension line of be is at point F, connecting Ce (1), proving: CD = DF (2) if ad = 2CD, please write all right angle triangles in the graph In the parallelogram ABCD, e is the midpoint of AD, the extension line of be is at the point F, connecting Ce (1), proving: CD = DF (2) if ad = 2CD, please write all right triangles and isosceles triangles in the graph
5. It is known that in △ ABC, ab = AC, BD = DC, AE bisects ∠ fac, try to guess the position relationship between AE and ad, please explain the reason
6. It is known that ab = AC, BD = DC, AE bisects ∠ fac, Q: is AE perpendicular to ad? Why?
7. The bisector of the outer angle fac of a triangle is AE, angle 1 equals angle 2, ad equals AC. verify that DC is parallel to Ae
8. It is known that E and F are two points on diagonal AC of parallelogram ABCD, and be = DF. It is proved that bfde is a parallelogram
9. It is known that EF in parallelogram ABCD is two points on diagonal BD, and be = DF. It is proved that bfde is parallelogram
10. It is known that, as shown in the figure, e and F are the triangles of diagonal AC of parallelogram ABCD
11. In the parallelogram ABCD, e f is two points on the diagonal AC, and AE = CF
12. As shown in the figure: in known quadrilateral ABCD, ab = ad, AE, AF divide ∠ BAC and ∠ CAD equally
13. In the known quadrilateral ABCD, ab = ad, AE, AF bisects the angle BAC and the angle CAD respectively
14. Known: as shown in the figure, the quadrilateral ABCD is a circle inscribed quadrilateral, e is a point on the diagonal ad, and ab = ad = AE verify: angle CAD = 2 angle CBE
15. As shown in the figure, take two points E and F on the diagonal AC of the parallelogram ABCD, if AE = cf. verify: ∠ AFD = ∠ CEB
16. As shown in the figure, in the isosceles trapezoid ABCD, ab ∥ CD, CE ∥ Da, known AB = 8, DC = 5, Da = 6, calculate the perimeter of △ CEB
17. As shown in the figure, in the isosceles trapezoid ABCD, ab ∥ CD, CE ∥ Da, known AB = 8, DC = 5, Da = 6, calculate the perimeter of △ CEB
18. In isosceles trapezoid ABCD, AB / / DC, CE / / DA, known AB = 12, DC = 8, Da = 6, find the perimeter of △ CEB
19. As shown in the figure, rectangular ABCD, e is a point on AB, fold the triangle CEB along CE, let Ge intersect DC at point F, if ∠ EFD = 80 °, calculate the degree of ∠ BCE
20. In the parallelogram ABCD, 2Ab = ad, angle B = 60 degrees, m and N are the midpoint of AD and BC respectively, are Mn and AC perpendicular to each other? Why? Urgent!