![](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 triangle ABC, the angle a plus the angle B is equal to the angle c, and the angle B is equal to twice the angle A. find the degree of the angle a, the angle B and the angle C
a=30,b=60,c=90
In triangle ABC, angle a minus angle B is equal to 15 degrees and angle c is equal to 75 degrees
The sum of the inner angles of the triangle is 180 degrees, the angle c is equal to 75 degrees, and the sum of that angle a plus angle B is 105 degrees. Because angle a minus angle B equals 15 degrees, angle a = 60 degrees and angle B = 45 degrees
As shown in the figure, △ ABC ≌ △ ade, and ∠ CAD = 10 °, B = ∠ d = 25 °, EAB = 120 °, calculate the degrees of ∠ DFB and ∠ DGB
∵△ABC≌△ADE，
∴∠DAE=∠BAC=1
2（∠EAB-∠CAD）=1
2(120°−10°)＝55°．
∴∠DFB=∠FAB+∠B=∠FAC+∠CAB+∠B=10°+55°+25°=90°
∠DGB=∠DFB-∠D=90°-25°=65°．
To sum up, ∠ DFB = 90 °, DGB = 65 °
Triangle ABC is equal to triangle ade and angle CAD is equal to 10 degrees, angle B is equal to angle D is equal to 25 degrees, and ead is equal to 125 degrees. The degrees of angle DFB and angle DGB are calculated
Where's your FG from? Just mark it for you!
As shown in the figure, △ ABC ≌ △ ade, and ∠ CAD = 10 °, B = ∠ d = 25 °, EAB = 120 °, calculate the degrees of ∠ DFB and ∠ DGB
∵△ABC≌△ADE，
∴∠DAE=∠BAC=1
2（∠EAB-∠CAD）=1
2(120°−10°)＝55°．
∴∠DFB=∠FAB+∠B=∠FAC+∠CAB+∠B=10°+55°+25°=90°
∠DGB=∠DFB-∠D=90°-25°=65°．
To sum up, ∠ DFB = 90 °, DGB = 65 °
In this paper, the relation between the upper corner of the graph and the upper corner of the graph is determined
∵①∠dac﹢∠c=∠ade﹢∠edb,②∠aed=∠b﹢∠edb,③∠b=∠c
ν ① - ②: 2 ∠ EDB = ∠ DAC
As shown in the figure, along the triangle ABC and the triangle ade are congruent triangles. The extension line angle of BC AD and point F, angle de at point G, angle ACB = 105 degrees, angle CAD = 10 degrees, angle d = 25 degrees, calculate the degrees of angle EAC, angle DFB and angle DGB
Because the triangle ABC and the triangle ade are congruent, angle B = angle D angle DAE = angle BAC because angle ACB = 105 degrees angle d = 25 degrees angle B = 25 degrees because angle ACB + angle B + angle BAC = 180 degrees, angle BAC = 50 degrees, so angle DAE = 50 degrees because angle EAC = angle CAD + angle DAE angle CAD = 10 degrees, angle EAC = 50 + 10 = 60 degrees because angle DFB =
In triangle ABC, if angle C plus angle a equals two angles B and angle c minus angle a equals 80 degrees, then what degree is angle c angle B angle a
Let the angles a, B and C be a, B and C respectively
c+a=180-b=2b
b=60
c-a=80
c=100 a=20
In the triangle ABC, angle a + angle B = 100 ° angle c = 2 angle B, calculate the degree of angle a, angle B and angle C
Angle a = 100 degrees - angle B
Angle a + angle + angle c = 180 degrees
100 degrees - angle B + angle B + 2 angle B = 180 degrees
Angle B = 40 degrees,
Angle a = 60 degrees,
Angle c = 80 degrees
In △ ABC, ∠ a - ∠ B = 36 °, C = 2 ∠ B, calculate the degree of ∠ B
∵∠A-∠B=36°，
∴∠A=∠B+36°，
According to the theorem of the sum of interior angles of triangles, it is found that ∠ a + ∠ B + ∠ C = 180 °,
∴∠B+36°+∠B+2∠B=180°，
The solution is ∠ B = 36 °
RELATED INFORMATIONS
- 1. In the triangle ABC, angle c + angle a = 2, angle B, angle c - angle a = 80 degrees, calculate the angles a, B, C for several degrees and tell how to calculate them
- 2. In ABC + S 2, we find the maximum area of △ 2, C = 2 for the root of ABC
- 3. 1. The degree ratio of the three inner angles of a triangle is 3:2:7. What is the largest angle? 2. There are three workshops in a factory. There are 90 people in workshop a. the number of people in workshop B is 4 / 5 of that in workshop a and 4 / 3 in workshop C. how many people are there in workshop C? 3. Xiaogang read a book, read 56 pages every day, read 4 days, just read 8 / 11 of the whole book. How many pages are there in this book? How many pages are left? 4. The tallest animal in the world is giraffe. A giraffe is 5 meters tall, 2 / 3 higher than an elephant. How many meters is the elephant tall?
- 4. In the acute angle △ ABC, if the degrees of the three inner angles are prime numbers, then the triangle () A. There is only one isosceles triangle B. There are at least two isosceles triangles C. There is only one, but not an isosceles triangle D. There are at least two of them, including non isosceles triangles
- 5. Given that the ratio of the degrees of the three inner angles of a triangle is 4:1:1, then the triangle is () triangle 1. Right angle 2, acute angle 3, obtuse angle
- 6. In △ ABC, ∠ a = 1 / 3 ∠ B = 1 / 5 ∠ C, calculate the degree of each internal angle of a triangle
- 7. If the ratio of the three inner angles of a triangle is 9:4:5, then the triangle is ()
- 8. As shown in the figure, △ ABC is an isosceles right triangle, ∠ a = 90 ° and points P and Q are moving points on AB and AC respectively, and satisfy BP = AQ, D is the midpoint of BC (1) It is proved that △ PDQ is an isosceles right triangle; (2) When the point P moves to where, the quadrilateral apdq is square, and explain the reason
- 9. As shown in the figure, in △ ABC, ∠ BAC = 90 °, extend Ba to point d so that ad = half AB, points E and F are the midpoint of edge BC and AC respectively. Find DF = AE
- 10. As shown in the following figure, in Δ ABC, ∠ B = 90 ° and point P moves from point a to point B at the speed of 1cm / s along the edge of AB, and point Q starts from point B and moves along the edge of BC to point C Cm / sec.) (1) If P and Q start from a and B at the same time, and P to B continue to move on the BC side, and Q to C continue to move on the CA side. After a few seconds, the area of Δ PCQ is equal to 12.6 cm? 2 Point Q starts from point B and moves along the edge of BC towards point C at a speed of 2 cm / s
- 11. If an isosceles triangle has a right angle and its area is 50 square centimeters, then the sum of its two right angles is______ Centimeter
- 12. If the area of a triangle is 30 square centimeters less than that of a parallelogram equal to its base and height, what is the area of the triangle?
- 13. The area of a parallelogram is 24 square centimeters. What is the area of the triangle with its equal base and height?
- 14. The circumference of a circular flower bed is 31.4 meters, and 2 / 5 of the poisonous land in the flower bed is planted with roses. How many square meters is the planting area of rose flowers?
- 15. 1. Around a circular flower bed with a diameter of 16 meters, there is a stone road with a width of 2 meters. What is the area of this stone road? 2. The bottom surface of a wooden basin is round. A 2.552m long iron wire is enclosed at its bottom, and 0.04m is used at the wire joint. What is the diameter of the bottom surface of the basin?
- 16. The perimeter of a circular flower bed is 18.84m. A stone road with a width of 0.5m is paved around it to calculate the area of the stone road
- 17. There is a circular flower bed with a diameter of 16m, and a 2m wide path is built around it (1) What is the area of this path? (2) How many lamps should be installed along the edge of the circular path every 5m?
- 18. A school plans to plant turf on a triangular open space. If it is known that this kind of turf costs a yuan per square meter, it needs at least () A. 450A yuan b.225a yuan c.150a yuan d.300a yuan Triangle ABC, ab = 20m, AC = 30m,
- 19. An isosceles right triangle flower bed, a right angle side of the triangle is 14 meters long. What is the area of this triangle flower bed
- 20. The height of a triangle is 5 or 2 meters. If the height is extended by 2 meters, the area of the triangle line will be increased by 10 square meters. What is the area of the original triangle