Square ABCD, AE + CF = EF, verification ∠ EDF = 45 degree
As shown in the figure, rotate ⊿ DCF clockwise 90 ≌ around d to ⊿ DAG, ≛ Ge = GA + AE = FC + AE = EF, ≛ DG = DF, ≌ DGE ≌ DFE (SSS), ≌ GDE ≌ FDE, GDE + FDE ≌ GDF = 90 ≌ EDF ≌
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- 1. As shown in the figure, in the quadrilateral ABCD, ab = CD, BF = De, AE ⊥ BD, CF ⊥ BD, e and f respectively. (1) prove: △ Abe ≌ △ CDF; (2) if AC and BD intersect at point O, prove: Ao = Co
- 2. As shown in the figure, e and F are two points on the diagonal BD of the quadrilateral ABCD, AE ‖ CF, AE = CF, be = DF
- 3. As shown in the figure, e and F are two points on the diagonal BD of the quadrilateral ABCD, AE ‖ CF, AE = CF, be = DF
- 4. As shown in the figure, e and F are two points on the diagonal AC and BD of rectangle ABCD, and AE = DF. Prove the congruent triangle COF of triangle BOE
- 5. As shown in the figure, in square ABCD, ∠ DAF = 25 °, AF intersects diagonal BD at e, intersects CD at F, then ∠ bec=______ Degree
- 6. As shown in the figure, in square ABCD, ∠ DAF = 25 °, AF intersects diagonal BD at e, intersects CD at F, then ∠ bec=______ Degree
- 7. As shown in the figure, in square ABCD, ∠ AFD = 65 ° AF and BD intersect at E
- 8. As shown in the figure, in rectangular ABCD, AF ⊥ BD, perpendicular foot is f, ∠ DAF = 3 ∠ BAF, calculate the degree of ∠ fac
- 9. It is known that e is the midpoint of the waist BC of the trapezoidal ABCD, and ab + CD = ad
- 10. 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
- 11. As shown in the figure, in square ABCD, ∠ EDF = 45 ° and the two sides of ∠ EDF intersect AB and BC respectively at e and F. try to explore the quantitative relationship between AE, EF and CF, and prove your conclusion
- 12. If the perimeter of a diamond is 8 cm and the height is 1 cm, the ratio of the degrees of the two adjacent angles of the diamond is 0——
- 13. If the perimeter of the diamond is 8 cm and the height is 1 cm, what is the degree ratio of the two collar angles of the diamond?
- 14. If the perimeter of the diamond is 8 cm and the height is 1 cm, what are the degrees of the two adjacent inner angles in the diamond?
- 15. It is known that the perimeter of the diamond is 16cm, and there is an internal angle of 60 degrees, then the shorter diagonal length of the diamond is______ cm.
- 16. If the perimeter of the diamond ABC is 16cm and an internal angle is 30 °, the area of the diamond ABC is
- 17. The perimeter of the diamond is 16cm, and one of its internal angles is 150 degrees?
- 18. The diamond has an area of 32 square centimeters, and an internal angle of 30 degrees. What is the perimeter of the diamond
- 19. If the perimeter of the diamond is 40cm and the ratio of the two adjacent angles is 1:2, the length of the shorter diagonal depends on the process
- 20. If the perimeter of the diamond is 8 cm and the height is 1 cm, the degree ratio of the two adjacent angles of the diamond is 0 How to prove it? What is the definition? Is the 30 degree angle of a right triangle equal to half of the hypotenuse?