The perimeter of the triangle ABC is 40 cm, ab = 14 cm, BC = (8 + 3x), AC = (15-2 / 3x). Find the value of X and judge what triangle ABC is?

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• 1. In △ ABC, a bisector ad intersects BC at point D, and ab = ad, and the extension of CM ⊥ ad intersects ad at point M. am = 1 / 2 (AB + AC)
• 2. As shown in the figure, we know that O is the inner part of triangle ABC, extend the circumscribed circle of Ao to D, and prove BD = od = CD
• 3. As shown in the figure, O is the middle line of the triangle ABC AD.BE.CF If the area of triangle AFO is 6, calculate the area of triangle ABC and the value of Ao: OD As shown in the figure, O is the middle line of the triangle ABC AD.BE.CF If the area of the triangle AFO is 6, calculate the area of the triangle ABC Find the value of Ao: OD
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• 6. In △ ABC, if (A2 + c2-b2) tanb = 3aC, then the value of angle B is______ ．
• 7. Given △ ABC, (Tana + 1) (tanb + 1) = 2, ab = 2, find: (1) the degree of angle c; (2) the maximum area of triangle ABC
• 8. In the triangle ABC, ab = AC = 2A, ∠ ABC = ∠ ACB = 15 degrees, BD is high, find the length of BD? (important process)
• 9. It is known that, as shown in the figure, in the triangle, AB equals AC equals 20cm, angle ABC equals angle ACB equals 15 degrees, and the area of triangle angle ABC is calculated Sorry, there is no picture. Let me describe it If this is the graph of the problem, the top point is a, the left side is B, and the right side is C. It is known that the left and right sides are equal to 20cm, and the two bottom sides are 15 ° to find the area of the triangle
• 10. In the triangle ABC, angle c = 90, ab = 10, AC = 6, find BC and area
• 11. As shown in the figure, it is known that P is a point on the side BC of △ ABC, and PC = 2PB. If ∠ ABC = 45 ° and ∠ APC = 60 °, find the size of ∠ ACB
• 12. As shown in the figure, P is a point on the side BC of △ ABC, and PC = 2PB. It is known that ∠ ABC = 45 ° and ∠ APC = 60 °, then the degree of ∠ ACB is___ °．
• 13. As shown in the figure, it is known that P is a point on the side BC of △ ABC, and PC = 2PB. If ∠ ABC = 45 ° and ∠ APC = 60 °, find the size of ∠ ACB
• 14. As shown in the figure, P is a point on the side BC of △ ABC, and PC = 2PB. It is known that ∠ ABC = 45 ° and ∠ APC = 60 °, then the degree of ∠ ACB is___ °．
• 15. P is a point on the BC side of the triangle, and PC = Pb. Given that the angle ABC is equal to 45 degrees and the angle APC is equal to 60 degrees, calculate the degree of the angle ACB?
• 16. If ∠ a = 4 ∠ B in the isosceles triangle ABC is known, the degree of ∠ C can be obtained
• 17. In the isosceles triangle ABC, if the ratio of degree between ∠ A and ∠ B is 5:2, then the degree of ∠ A is? Urgent need
• 18. The triangle ABC is isosceles triangle, ∠ a = 86 °, 1 = 2, 3 = 4, find the degree of ∠ 5
• 19. It is known that the triangle ABC is an isosceles triangle with an angle of 3 = 105 ° and the degree of angle 2 and angle 1 On the course evaluation
• 20. If O is the outer center of the acute triangle ABC and Ao, Bo and co intersect with L, m and N respectively, then Ao: Al + Bo: BM + CO: CN=