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!

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• 1. The isosceles triangle ABC has an angle of 30 °, what is ∠ B? I don't know what angle is 30 degrees
• 2. In the isosceles triangle ABC, if angle a is equal to 30 degrees, then how many degrees is angle B
• 3. 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?
• 4. It is known that ad is the height on the waist of an isosceles triangle, and the degree of vertex angle is 0
• 5. If ad is the height on the waist of isosceles △ ABC and ∠ DAB = 60 °, then the degrees of the three angles of △ ABC are______ ．
• 6. 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
• 7. 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
• 8. Given that the center of gravity of △ ABC is g, GA = 3, GB = 4, GC = 5, calculate the area of △ ABC
• 9. 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
• 10. 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
• 11. In the isosceles triangle ABC, if angle a = 36 degrees, what is angle B
• 12. 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
• 13. Triangle ABC is isosceles triangle, and angle a is 36 degrees Find the value of BC / ab
• 14. In triangle ABC, angle a = 2, angle B. when angle c =? It is an isosceles triangle Such as the title
• 15. 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
• 16. In the known isosceles triangle ABC, the angle a = 80 ° is used to find the degree of the other two angles step
• 17. 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
• 18. In RT △ ABC, if the hypotenuse AB = 5 and the right angle BC = 5, then the area of △ ABC is______ ．
• 19. 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
• 20. 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