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It is known that ad is the height on the waist of an isosceles triangle, and the degree of vertex angle is 0
If ad intersects the line segment of BC: Yes (angle B is the vertex angle)
Because the angle DAB is 60 degrees and ad is perpendicular to BC, the angle ADB is 90 degrees,
The angle abd = 90-60 = 30 degrees, that is, the vertex angle = 30 degrees
If ad intersects the extension line of BC: Yes (angle B is the vertex angle)
Because the angle DAB is 60 degrees and ad is perpendicular to BC, the angle ADB is 90 degrees,
The angle DBA is 30 degrees, the vertex angle is 180-30 = 150 degrees
RELATED INFORMATIONS
- 1. If ad is the height on the waist of isosceles △ ABC and ∠ DAB = 60 °, then the degrees of the three angles of △ ABC are______ ．
- 2. It is known that ad is the height of the waist BC of isosceles △ ABC, ∠ DAB = 60 ° and the inner angles of the triangle are calculated
- 3. As shown in the figure, in △ ABC, ∠ ABC = ∠ ACB, D is on the line BC, e is on the line AC, and ∠ ade = ∠ AED (1) explore the quantitative relationship between ∠ bad and ∠ CDE and explain the reason (2) If D is on the extension line of CB and E is on the extension line of AC, is the conclusion in (1) still valid
- 4. Given that the center of gravity of △ ABC is g, GA = 3, GB = 4, GC = 5, calculate the area of △ ABC
- 5. Let G be the center of gravity of the triangle, GA = 2 times the root 3, GB = 2 times the root 2, GC = 2, and find the area of the triangle ABC
- 6. As shown in the figure, in square ABCD, e is a point on CD, extend BC to F, make CF = CE, connect DF, be and DF intersect at g, prove: BG ⊥ DF
- 7. As shown in the figure, in equilateral △ ABC, D is a point on the edge of BC, e is a point on the edge of AC, and ∠ ade = 60 °, BD = 3, CE = 2, then the area of △ ABC is () A. 813B. 8132C. 8134D. 8138
- 8. The triangle ABC in the right figure is an isosceles right triangle with a right edge of 4cm. Calculate the area of the shadow part The picture is wrong
- 9. As shown in the figure, in △ ABC, angle c = 90 °, de ⊥ AB and D, intersection AC and E, if BC = BD, AC = 4cm, BC = 3cm, ab = 5cm, calculate △ ad Find the perimeter of the triangle ade,
- 10. It is known that in RT △ ABC, ∠ BAC = 90 °, ab = 5cm, AC = 6cm, and the height ad on the edge of BC = 4cm. What is the radius of the circumscribed circle of △ ABC
- 11. 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?
- 12. In the isosceles triangle ABC, if angle a is equal to 30 degrees, then how many degrees is angle B
- 13. The isosceles triangle ABC has an angle of 30 °, what is ∠ B? I don't know what angle is 30 degrees
- 14. 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!
- 15. In the isosceles triangle ABC, if angle a = 36 degrees, what is angle B
- 16. 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
- 17. Triangle ABC is isosceles triangle, and angle a is 36 degrees Find the value of BC / ab
- 18. In triangle ABC, angle a = 2, angle B. when angle c =? It is an isosceles triangle Such as the title
- 19. 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
- 20. In the known isosceles triangle ABC, the angle a = 80 ° is used to find the degree of the other two angles step