In △ ABC, ∠ C = 90 °, D, e and F are points on edges AB, AC and BC respectively, and the quadrilateral decf is a square if ad = 7

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• 1. If ad = 6 and BD = 5, the sum of areas of △ ADF and △ BDE can be obtained
• 2. In the triangle ABC, ∠ ACB = 90 ° points D and E are the middle points of AC and ab respectively, point F is on the extension line of BC, tangent ∠ CDF = ∠ a, prove that decf is ‖ quadrilateral
• 3. In △ ABC, ∠ BCA = 90 degrees, D and E are the middle points on the sides of AC and ab respectively, f is on the extension line of BC, ∠ CDF = ∠ a It's a proof
• 4. In △ ABC, ∠ ACB = 90 °, De is the median line of △ ABC, point F is on the extension line of BC, and ∠ CDF = ∠ a
• 5. As shown in the figure, in the right triangle ABC, the quadrilateral efbh is a square, ab = 21cm, BC = 28cm, AC = 35cm, ED is perpendicular to AC, ed = 8.4cm, what is the area of the square efbh?
• 6. As shown in the figure, in the right triangle ABC, D is the middle of hypotenuse AB, ED is perpendicular to point D, BC intersects point E, ab = 20, AC = 12. Find the area of quadrilateral Adec
• 7. As shown in the figure, in the right triangle ABC, e is the intersection of the bisectors of two acute angles, ed ⊥ BC is D, EF ⊥ AC is F. can you explain that the quadrilateral cdef is a square?
• 8. As shown in the figure, the triangle ABC is a right triangle, and the quadrilateral befd is a square. Given that the lengths of AB and BC are 12 cm and 20 cm respectively, what is the square area?
• 9. Triangle ABC is a right triangle, quadrilateral ACDE, fgba are square, ab = 8 cm, BC = 6 cm, triangle AEF
• 10. As shown in the figure, the triangle ABC is a right triangle, the quadrilateral EDFC is a square, the sum of the areas of the two shadow triangles is 32 square centimeters, ad: DB = 4:1, find the length of AD
• 11. Cdef is the inscribed square of RT triangle ABC, BC = 2, AC = 1, find the square cdef area
• 12. As shown in the figure, in RT △ ABC, the bisector of ∠ a = 90 °, the bisector of ∠ B intersects AC at e, the height ah on the side of intersecting BC is at D, DF / / BC intersects AC at F through D, and the verification is: AE = FC
• 13. RT triangle ABC, ∠ a = 90 °, bisector of ∠ B intersects AC at D, vertical line from a as BC intersects BD at e, and vertical line from D as DF, so aefd is proved to be diamond
• 14. As shown in the figure, in △ ABC, the bisector of ∠ a = 90 ° and ∠ B intersects AC at D, ah and DF are perpendicular to BC, h and F are perpendicular feet
• 15. As shown in the figure, in △ ABC, the bisector of ∠ a = 90 ° and ∠ B intersects AC at D, ah and DF are perpendicular to BC, h and F are perpendicular feet
• 16. As shown in the figure, in △ ABC, the bisector of ∠ a = 90 ° and ∠ B intersects AC at D, ah and DF are perpendicular to BC, h and F are perpendicular feet
• 17. What is the full English name of NBA, PRC, VOA, EQ and WTO
• 18. It is known that in △ ABC, ab = 20, AC = 15, and the height of BC is 12, then the length of BC is______ ．
• 19. How to use the inverse function method to find the range of y = CX + D / ax + B (a ≠ 0)
• 20. The range of function y = x ^ 2-2x + 2, X ∈ [2,7] is