![](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>)
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
Three angles of 120 ° 30 ° are obtuse
If one of the interior angles of an isosceles triangle is 80 degrees, then the degrees of the other two inner angles are______ .
① When the angle of 80 ° is the top angle, the two bottom angles are 50 ° and 50 °;
② When the angle of 80 ° is the base angle, the top angle is 20 °
So the answer is 50 degrees, 50 degrees or 20 degrees, 80 degrees
Math problem: an inner angle of an isosceles triangle is 43 degrees. What are the degrees of the other two angles
When 43 is a vertex angle, the other two are both 68.5
When 43 is a base angle, the other two are 94 and 43
If a triangle has two interior angles equal to 90 degrees, then the triangle is______ Triangle
The sum of the inner angles of a triangle is 180 ° if the sum of two inner angles is equal to 90 °, then the other inner angle is 180 ° - 90 ° = 90 °, therefore, the triangle is a right triangle;
So the answer is: right angle
If the sum of the degrees of two interior angles of a triangle equals 90 degrees, then the triangle is a triangle
Because the sum of the degrees of two inner angles is equal to 90 degrees, the other angle is 90 degrees, so it is a right triangle
If one interior angle of a triangle is equal to the sum of the other two, then the degree of the largest angle of the triangle is
Solution: the sum of the inner angles of a triangle is 180 ° if one of the inner angles of the triangle is equal to the sum of the other two inner angles, then the maximum inner angle is a, then the sum of the other two inner angles is 180 ° - A. according to the meaning of the topic, a = 180 ° - A is obtained, and a = 90 ° is obtained
In triangle ABC, we know that angle a is three times of angle B and angle c is two times of angle B. the degree of angle a, angle B and angle c is obtained To calculate
Angle a + angle B + angle c = 180
3B+B+2B=180
B=30
A=90
C=60
Find the degree of ＜ a ＜ B ＜ C
Angle a 36 degrees, angle B angle c 72 degrees
Given that one of the interior angles of a triangle is two-thirds of the other and four fifths of the third, the degrees of the inner angles of the triangle are Notice two-thirds and four fifths
Let this inner angle be x, and the sum of three inner angles of triangle is 180 °
Then x + (3 / 2 + 5 / 4) x = 180
X = 48, the other two = 48 * 3 / 2 = 72
=48*5/4=60.
It is known that the degree of one inner angle of a triangle is two-thirds of the degree of the other, and four fifths of the degree of the third inner angle Find the degrees of the interior angles of the triangle
Let an inner angle be X
2/3X+4/5X+X=180
RELATED INFORMATIONS
- 1. In △ ABC, ∠ a = 1 / 3 ∠ B = 1 / 5 ∠ C, calculate the degree of each internal angle of a triangle
- 2. If the ratio of the three inner angles of a triangle is 9:4:5, then the triangle is ()
- 3. 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
- 4. 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
- 5. 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
- 6. As shown in the figure, in △ ABC, ab = 6cm, BC = 8cm, ∠ B = 90 °, point P starts from point a and moves along side AB at a speed of 1cm / s, and point Q starts from point B along the edge of BC Point C moves at a speed of 2 cm / s 1) If the points P and Q start from a and B at the same time, after a few seconds, the area of △ PBQ is equal to 8cm? 2) If points P and Q start from a and B at the same time, and P reaches point B and then continues to move on edge BC, and Q reaches point C and then continues to move on edge Ca, after a few seconds, the area of △ PCQ is equal to 9cm?
- 7. In the triangle ABC, AC = 6cm, BC = 8cm, ab = 10cm, D, e, f are the midpoint of AB, BC and Ca, respectively. Calculate the area of triangle def
- 8. In the triangle ABC, angle B = 90 °, ab = 6, BC = 3, point P moves from point a to side AB at a speed of 1cm / s, and point Q moves at 2cm / s At the same time, what is the distance from the starting point of PQ B to the starting point B of PQ, respectively, if the starting point of PQ B is equal to the starting point of B?
- 9. In the right triangle ABC, the angle c = 90 degrees, AC = 4, BC = 3, ab = 5, P is the intersection point of the bisector of the inner angle of the triangle ABC. Find the distance between P and each side
- 10. As shown in the figure, △ ABC, D is on the extension line of BC, and AC = CD, CE is the middle line of △ ACD, and CF bisects ∠ ACB As shown in the figure, △ ABC, D is on the extension line of BC, and AC = CD, CE is the center line of △ ACD, CF bisects ∠ ACB, intersects AB and F, and proves (1) ce ⊥ CF: (2) CF is parallel to AD
- 11. 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
- 12. 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?
- 13. In ABC + S 2, we find the maximum area of △ 2, C = 2 for the root of ABC
- 14. 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
- 15. 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
- 16. 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
- 17. 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?
- 18. The area of a parallelogram is 24 square centimeters. What is the area of the triangle with its equal base and height?
- 19. 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?
- 20. 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?