Given △ ABC ≌ △ def, and ∠ a = 52 °, B = 31 °, de = 10cm, if ∠ f = ∠ C, find the degree of ∠ F and the length of ab

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• 1. Given △ ABC ≌ △ def, and ∠ a = 52 & # 186;, ∠ B = 31 & # 186;, ed = 10cm, if ∠ f = ∠ C, find the degree of ∠ F and the length of ab
• 2. As shown in the figure, triangle ABC is equal to triangle def, and angle a is equal to 52%, angle B = 31.21'ed = 1ocm
• 3. It is known that ab ‖ De, BC ‖ EF, D, C are on AF, and ad = CF
• 4. Given; point b.e.c.f is on the agreed line, ab = De, angle a = angle D, AC bisects DF; triangle ABC congruent triangle def, be = CF
• 5. As shown in the figure, points B, D, C, f are on a straight line, ab = De, angle a = angle D, AC is parallel to DF, prove 1, triangle ABC is equal to def 2, be = CF
• 6. The double length method of the central line of congruent triangle: ad is the central line of triangle ABC, e and F are on AB and AC respectively, and De is perpendicular to DF, then what is the relationship among be, CF and ef?
• 7. Let o be the heart of the triangle ABC and AO intersect BC with D. if BC = A and the circumference of the triangle ABC is l, then a and L are used to express the ratio AO / OD=
• 8. It is known that: as shown in the figure, ∠ ABC = ∠ DCB, BD and Ca are bisectors of ∠ ABC and ∠ DCB respectively, BD and Ca intersect at o Although a little mistake, but also thank you very much!
• 9. Given that point O is any point in equilateral triangle ABC, connect OA and extend to e, so that AE = OA Taking OB and OC as adjacent sides, make parallelogram obfc and connect EF BC.EF= Root 3bC
• 10. (1) Given that point O is any point on the plane of equilateral triangle ABC, connect OA and extend to e such that AE = OA with OB.OC Make a parallelogram obfc for the adjacent edge and connect EF. Please explore the quantitative relationship between EF and BC. (2) Given that point O is any point on the plane of the isosceles right triangle ABC (BC is the hypotenuse), connect OA and extend to e, so that AE = OA. Take ob.oc as the adjacent side, make a parallelogram obfc, connect EF. Then the quantitative relationship between EF and BC is () (3) given that point O is any point on the plane of right triangle ABC (BC is the hypotenuse), connect OA and extend it to e, so that AE = OA, and connect EF with OB and OC as parallelogram obfc. Please explore the quantitative relationship between EF and BC.
• 11. If △ ABC ≌ Δ DEF is known, and the maximum angle of △ ABC is 100 °, then the maximum angle of △ DEF is______ ．
• 12. Given ABC congruent triangle def, ab = 5, s triangle ABC = 10, find the height of de side in triangle def
• 13. As shown in the figure, the known points E and C are on the line BF, be = CF, ab ‖ De, ∠ ACB = ∠ F
• 14. Known: △ ABC ≌ △ EDC. Verification: be = ad
• 15. As shown in the figure, given that AD and be are the heights of △ ABC, ad and be intersect at point F, and ad = BD, can you find the congruent triangle in the figure? If you can find it, please explain why
• 16. As shown in the figure, the triangles ABC, congruent triangles def, am and DN are respectively the bisectors of the angles of the triangles ABC and def
• 17. Given three points a (0,4) B (- 3,0) C (3,0), now draw a parallelogram with ABC as the vertex. Please draw a figure according to the coordinates of three points and write out the coordinates of D
• 18. If EF = de + BF, then ∠ ECF = (). How do you get it, please give a brief introduction There is a little E on the edge ad of square ABCD, and a little f on ab. if EF = de + BF, then ∠ ECF = (). How do you get it, please give a brief explanation Don't be fussy when explaining, try to use mathematical laws and symbols (I'm junior one, please use the rotation change of junior one to solve this problem)
• 19. E. If f is the trisection of the hypotenuse of ABC, then Tan angle EFC =? I'm sorry. I'm asking for tanecf
• 20. If P and Q are the triangles of the hypotenuse BC, then Tan ∠ PAQ =?