In the triangle ABC, ab = AC, BD = DC, take any point E in ad to judge the relationship between be and EC

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• 1. As shown in the figure, in △ ABC, point E is on AB, point D is on BC, BD = be, ∠ bad = ∠ BCE, ad and CE intersect at point F. try to judge the shape of △ AFC and explain the reason
• 2. It is known that, as shown in the figure, D is a point inside △ ABC connecting BD and ad, with BC as the edge, outside △ ABC, make ﹥ CBE = ﹥ abd, ﹥ BCE = ﹥ bad, be and CE cross to e, connecting de. (1) verification: bcab = bebd; (2) verification: ﹥ DBE ﹥ ABC
• 3. As shown in the figure, D is a point inside the triangle ABC, connecting BD and ad, taking BC as the edge, making an angle outside the triangle ABC, CBE = angle abd, BCE = angle bad, be, CE intersecting at point E, connecting de. prove that the triangle DBE is similar to the triangle ABC
• 4. As shown in the figure △ ABC, ad ⊥ BC, be ⊥ AC, BF = AC, if ∠ EBC = 25 °, then ∠ ACF=______ ．
• 5. As shown in the figure △ ABC, ∠ BAC = 90 & ordm;, ad ⊥ BC, ∠ Abe = ∠ EBC, EF ⊥ BC, FM ⊥ AC, DF = FM
• 6. As shown in the figure, ad and be are the heights of BC and AC respectively in ABC
• 7. In triangle ABC, ad is perpendicular to BC and D, be is the middle line, and the angle EBC is 30 degrees
• 8. As shown in the figure, D is a point on side AC of triangle ABC, CD = 2ad, AE is perpendicular to BC and E, if BD = 8, Tan angle abd = 3 / 4, find the length of AC
• 9. As shown in the figure, make equilateral triangles △ abd, △ EBC, △ fac on the same side of BC with the three sides of △ ABC respectively, and prove that the quadrilateral ADEF is a parallelogram
• 10. As shown in the figure, BD is divided into two parts, be is divided into ABC 2:5, DBE = 21 ° and the degree of ABC is calculated
• 11. As shown in the figure, in the linear triangle ABC, ∠ C = 90 °, BD is the angular bisector of △ ABC, be is the angular bisector of △ BDA, DF is the height of △ BDE
• 12. The two right sides of a right triangle are 60cm and 80cm respectively
• 13. The two right sides of a right triangle are 60cm and 80cm respectively. How many square centimeters is its area? The hypotenuse of this triangle is 100cm long. How high is the hypotenuse?
• 14. The lengths of the two right sides of a right triangle are 60cm and 80cm respectively. Find the perimeter of the right triangle and the height on the hypotenuse,
• 15. The lengths of the two right sides of a right triangle are 60cm and 80cm respectively. Find the perimeter of the right triangle and the height on the hypotenuse
• 16. The perimeter of a right triangle is 60cm, the shortest side is 15cm, and the largest side is 15cm Second, given that the sum of the two right sides of a right triangle is 34 cm, and the difference between the two right sides is 14 cm, what is the area of the triangle?
• 17. The hypotenuse of a right triangle is 100cm, one is 60cm, and the other is 80cm. How high is the hypotenuse? Because I am only a primary school student.
• 18. The three sides of a right triangle are 3cm 4cm 5cm. The area of the triangle is the square of () cm, and the height of the hypotenuse is () cm?
• 19. The two right sides and hypotenuse of a right triangle are 3cm, 4cm and 5cm respectively?
• 20. The three sides of a right triangle are 3cm, 4cm and 5cm respectively. The height of its hypotenuse is () cm