It is known that in rectangular ABCD, ab = 2CB, point E is on DC, and AE = AB, then ∠ EBC=___ .

Divide a rectangle into two squares (perpendicular to ab through e). Isn't be the diagonal of the square? So the answer should be 45 degrees

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1. As shown in the figure, in rectangular ABCD, e is a point on DC, AE = AB, ab = 2ad, then the degree of ∠ EBC is______ ．
2. Given AB = 2BC of rectangle ABCD, take point E on CD so that AE = EB, then what is the angle EBC equal to
3. Given AB = 2BC of rectangle ABCD, take point E on CD to make AE = EB, then the angle EBC is equal to A 60 B 45 C 30 D 15
4. E is a point on the edge CD of rectangle ABCD, and AE = AB, ab = 2BC, find the degree of ∠ EBC
5. As shown in the figure, in known rectangle ABCD, ab = 2ad, e is a point on CD and AE = AB, (1) calculate the degree of angle CBE, (2) if ad = 2cm, calculate the degree of angle CBE
6. As shown in the figure: in rectangular ABCD, ab = 2ad, e is a point on CD, and AE = AB, then ∠ CBE is equal to______ ．
7. In the parallelogram ABCD, we know that E F is on the diagonal BD, e point is close to D f point is close to B, and AE / / CF indicates that ade congruent CBF
8. It is known that in the trapezoid ABCD. Ab | CD. E is the midpoint of BC. The angular extension line of the straight line AE intersecting DC is at point F D``C`````F `````````` `````E ```````` ````````` A````````B
9. As shown in the figure, in the trapezoidal ABCD, ad ∥ BC, ∠ B = 30 ° and ∠ C = 60 ° e, F, m and N are the midpoint of AB, CD, BC and Da respectively. Given BC = 7 and Mn = 3, then EF=______ ．
10. In trapezoidal ABCD, AD / / BC, ∠ B = 40 ° and ∠ C = 50 °, e, m, F and N are the midpoint of AB, BC, CD and Da respectively, and EF = a, Mn = B 6. In trapezoidal ABCD, AD / / BC, ∠ B = 40 ° and ∠ C = 50 °, e, m, F and N are the midpoint of AB, BC, CD and ad respectively, and EF = a, Mn = B, then what is the length of BC? (expressed by the algebraic formula of a and b)! It's a process! hurry up!
11. In the quadrilateral ABCD, ad ≠ BC, ab = DC, E on the side of BC, AE = De, BF = EC (1) Judge the shape of quadrilateral ABCD and prove it (2) If AB = ad = 10, BC = 22, find the area of quadrilateral ABCD
12. Trapezoid ABCD AB parallel DC ad = BC AE, BF are the height of two waist respectively, and AE, BF intersect with point o Let BAE = x and C = y find out and prove the relation between X and y
13. Geometry e is a point of ad on the edge of square ABCD, BF bisects ∠ EBC intersects DC with F, and proves that EB = AE + CF
14. It is known that in square ABCD, point E is the point above ad, BF bisects ∠ EBC, intersects DC at point F, and the proof is: be = AE + CF
15. As shown in the figure, in the known square ABCD, e is the point on ad, BF bisects ∠ EBC intersects DC at point F
16. In trapezoidal ABCD, AD / / BC, ab = DC, angle ABC = 80 °, e is the point on lumbar CD, connecting be, AC and AE, if angle ACB = 60 ° and angle EBC = 50 ° Find the degree of the triangle EAC
17. For the isosceles trapezoid ABCD, ad is parallel to BC, ad = 2cm, BC = 8cm, e is the midpoint of the lumbar CD, be divides the trapezoid into two parts, the perimeter difference is 3cm, and calculates the length of ab I only have the second grade of junior high school, and I am learning the median line of triangle and trapezoid. I hope you can help me solve the problem according to the direction of this theorem
18. It is known that e is the midpoint of the waist BC of the trapezoidal ABCD, and ab + CD = ad
19. As shown in the figure, in rectangular ABCD, AF ⊥ BD, perpendicular foot is f, ∠ DAF = 3 ∠ BAF, calculate the degree of ∠ fac
20. As shown in the figure, in square ABCD, ∠ AFD = 65 ° AF and BD intersect at E