![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
In the isosceles triangle ABC, the opposite sides of angle a, angle B and angle c are a, B and C respectively. A = 3 is known B and C are the two real roots of the quadratic + MX + 2-1 / 2m = 0 of the equation x about X. find the perimeter of △ ABC
（1） Edge a is a waist of a triangle: then the equation has a root of 3, take X1 = 3 into the equation: 3 ^ 2 + 3M + (1 / 2) M = 0, get m = - (18 / 7) into the equation, use the root formula to find another root x2: X2 = [9 ± 3 * 2 (1 / 2)] / 7, which is also the bottom edge length of the triangle; or
RELATED INFORMATIONS
- 1. In triangle ABC, angle a = 2, angle B. when angle c =? It is an isosceles triangle Such as the title
- 2. Triangle ABC is isosceles triangle, and angle a is 36 degrees Find the value of BC / ab
- 3. In the isosceles triangle ABC, ab = AC, angle a = y degree, angle B = x degree 1. The function analytic expression of Y with respect to X 2. The value range of independent variable x 3. Vertex degree when x = 35
- 4. In the isosceles triangle ABC, if angle a = 36 degrees, what is angle B
- 5. The ABC angle a of isosceles triangle is 100 degrees An isosceles triangle ABC, angle a is 100 degrees, extend AB to D, make ad = BC, calculate the degree of angle BCD!
- 6. The isosceles triangle ABC has an angle of 30 °, what is ∠ B? I don't know what angle is 30 degrees
- 7. In the isosceles triangle ABC, if angle a is equal to 30 degrees, then how many degrees is angle B
- 8. An isosceles triangle ABC (as shown in the figure) has a circumference of 28cm. The heights of its two sides are 5cm (AD) and 4cm (be). What is the area of this isosceles triangle in square centimeter?
- 9. It is known that ad is the height on the waist of an isosceles triangle, and the degree of vertex angle is 0
- 10. If ad is the height on the waist of isosceles △ ABC and ∠ DAB = 60 °, then the degrees of the three angles of △ ABC are______ ．
- 11. In the known isosceles triangle ABC, the angle a = 80 ° is used to find the degree of the other two angles step
- 12. There is a RT △ ABC, a = 90 °, B = 60 ° and ab = 1, which is placed in the rectangular coordinate system Let the hypotenuse BC be on the x-axis and the right angle vertex a be on the inverse scale function y = radical 3 / x, and calculate the coordinate of point C (I will solve this problem, and the key is the next one). If we change the conditional hypotenuse BC on the x-axis to hypotenuse BC on the coordinate axis and point a on the image y = radical 3 / x, then calculate the coordinate of point C If it's OK, I'll give you extra points and help me solve it by next Monday
- 13. In RT △ ABC, if the hypotenuse AB = 5 and the right angle BC = 5, then the area of △ ABC is______ ．
- 14. There is a RT triangle ABC, BC = 2, AC = radical 3, ab = 1. Put it in the rectangular coordinate system, BC is on the x-axis, and the right angle vertex is on the y = radical 3 / X image, and find the coordinates of point C
- 15. In the rectangular coordinate system with o as the origin, point a (4, - 3) is the right angle vertex of △ OAB In the rectangular coordinate system with o as the origin, point a (4, - 3) is the right angle vertex of △ OAB. It is known that | ab | = 2 | ab |, and the ordinate of point B is greater than zero Find the cosine value of the obtuse angle formed by the middle line on the two right angle sides of RT △ OAB It's a vector that can't be typed
- 16. In the rectangular coordinate system, a (4, - 3) is the right angle vertex of OAB, and / AB / = 2 / OA /, the coordinates of vector AB are obtained //Represents absolute value, OAB is triangle
- 17. In the rectangular coordinate system with o as the origin, point a (4, - 3) is the right angle vertex of △ OAB. It is known that | ab | = 2 | OA |, and the ordinate of point B is greater than 0 1. Find the coordinates of vector ab 2. Find the equation of circle X & # 178; - 6y + Y & # 178; + 2Y = 0 with respect to the circle with OB symmetry
- 18. As shown in the figure, △ ABC, ad is the midline, AE is the bisector of angles, CF ⊥ AE is f, ab = 5, AC = 2, find the length of DF
- 19. As shown in the figure, in △ ABC, ∠ ACB = 90 °, AC = BC, point D is the midpoint of AB, AE = CF
- 20. As shown in the figure, D, e and F are respectively the midpoint of △ ABC, G is the midpoint of AE, and be intersects DF and DG at P and Q, then PQ: be=______ ．