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Each vertex of the triangle ABC makes a parallel line AD / / be / / FC, which intersects with the extension of BC, Ca and BA at points D, e and f respectively Prove s triangle def = s double triangle ABC
It is obvious that the height of triangle ADB and age is equal to each other, and the other side is the same. We only need to prove 2 * ad = DG, that is, ad = AG, AD / CF = BD / BF = ed / EC = Ag / CF
As shown in the figure, ∠ C = 90 ° in △ ABC, MD is the vertical bisector of AB, intersecting BC with D, intersecting AB with m, BD = 8cm, ∠ ADC = 30 ° to find the length of AD and AC
Among the following figures, the one that is not axisymmetric is ()
① Line segment (2), flat quadrilateral (3), angle
What is not an axisymmetric figure is a flat quadrilateral
Where (1) the axis of symmetry of the line segment is any vertical line of the line segment and the line segment is in. The axis of symmetry of the angle is the line bisector of the angle is in
Among the following figures, the figure which is not necessarily axisymmetric is ()
A. Isosceles triangle B. segment C. obtuse angle D. right triangle
What must be true in the following formula is ()
A.（a-b）²=a²-2ab+b² B.（-a-b）²=a²-2ab+b²
If X & # 178; + MX-15 = (x + 3) (x + n), then the value of M is ()
A.-5 B.5 C.-2 D.2
13604.5 billion yuan is expressed in scientific notation (four significant figures are reserved) as ()
A. 1.361 × 10 ^ 13 yuan b.1.361 × 10 ^ 12 yuan c.1.360 × 10 ^ 12 yuan d.1.360 × 10 ^ 13 yuan
The only triangle that can't be made is ()
A. Known two sides and their included angles B. known two corners and their included edges C. known diagonal angles of two sides and one side D. known three sides
In the following figures, the figure which is not necessarily axisymmetric is (d) A. isosceles triangle B. line segment C. obtuse angle D. right triangle. What must be true in the following formula is (a) A. (a-b) &# 178; = A & # 178; - 2Ab + B & # 178; B. (- a-b) &# 178; = A & # 178; - 2Ab + B & # 178; if X & # 178; + MX-15 = (x + 3)
The following figures are not necessarily axisymmetric ()
A. Right angle
B. Right triangle
C. Isosceles triangle
The following figures are not necessarily axisymmetric (b)
If you have any questions, please ask; if you are satisfied, please accept, thank you!
Axisymmetric figures (), () have only one axis of symmetry
There are many, such as isosceles triangle, isosceles trapezoid, sector, etc
The axis of symmetry of an axisymmetric figure is a line______ Line
The axis of symmetry of an axisymmetric figure is a straight line
An axisymmetric figure has at least one axis of symmetry______ (judge right or wrong)
If a figure is folded in half along a straight line and the figures on both sides can completely coincide, the figure is an axisymmetric figure. The line where the crease is located is called the axis of symmetry. Therefore, the axisymmetric figure has at least one axis of symmetry, so the answer is: correct
Which of the 26 letters are axisymmetric?
In words: a B C D E h I K Mo t U V W x y
Lowercase: C O V W x
Which letters are axisymmetric
A B C D E H I K M O T U V W X Y
RELATED INFORMATIONS
- 1. AB = ad ∠ ABC = ∠ ADC, AC and BD intersect at point O. it is proved that AC is the vertical bisector of BD
- 2. As shown in the figure, we know that the side length of equilateral triangle ABC is 3, M is a point on AC, passing through point m, make me parallel AB, intersect BC at point E, make MF ⊥ AB at point F, let AF = x, the median line length of trapezoidal emfb is y, find out the function analytic formula of Y and X, and write out the value range of X
- 3. In △ ABC, ab = AC, ∠ BAC = 80 ° and P is a point in △ ABC, so that the angle PBC = 10 ° and ∠ PCA = 20 °. Find the degree of ∠ PAC
- 4. As shown in the figure, in △ ABC, ab = AC, ∠ BAC = 80 °, point P is within △ ABC, ∠ PBC = 10 °, PCB = 30 °, calculate the degree of ∠ BAP What are you doing?
- 5. If the inscribed circle of RT triangle is tangent to the hypotenuse AB at D, and ad = 1, BD = 2, then s ABC =? AB is the hypotenuse If the inscribed circle of RT triangle and hypotenuse AB are tangent to D, and ad = 1, BD = 2, then s ABC =? AB is hypotenuse How to use area
- 6. In △ ABC, the vertical bisectors of AB and AC intersect BC at points E and f respectively. If ∠ BAC = 115 °, then ∠ EAF=______ Degree
- 7. In △ ABC, ∠ C = 90 ° and the intersection line BC of AB is at D. if ∠ bad - ∠ DAC = 22.5 °, then the degree of ∠ B is______ ．
- 8. It is known that in △ ABC, points D, e and F are points on BC, AB and AC respectively, AF is parallel to ED, and AF = ed, extend FD to point G, so that DG = FD, and verify that ED and Ag are equally divided,
- 9. (1 / 3) the known triangles ABC, (|) BD and CE are bisectors of angle B and angle c, respectively. Through point a, make AF vertical BD, Ag vertical CE, the perpendicular feet are f, G, connecting FG (1 / 3) the known triangles ABC, (|) BD and CE are bisectors of angle B and angle c, respectively. Through point a, make AF vertical BD, Ag vertical CE, and the perpendicular feet are f, G, connecting FG. (2) if C
- 10. In ABC, BD is the inner bisector of angle B, CE is the outer bisector of angle c, AF is perpendicular to BD, Ag is perpendicular to CE, FG and ABC?
- 11. As shown in the figure, △ ABC is an equilateral triangle, the bisectors of ∠ ABC and ∠ ACB intersect at O, Bo and Co, and the vertical bisectors of CO intersect at e and F As shown in the figure, △ ABC is an equilateral triangle, the bisectors of ∠ ABC and ∠ ACB intersect at points o, Bo and Co, the vertical bisectors of BC intersect at points E and F, and the perpendicular feet are m and N respectively
- 12. In the quadrilateral ABCD, point O is the midpoint of CD, Ao and Bo bisect ∠ DAB, ∠ ABC, ∠ AOB = 120 ° respectively, and prove AD + Half DC + BC = ab
- 13. Is a axisymmetric figure
- 14. Draw two circles to make the figure have two symmetrical axes
- 15. What time is it
- 16. List one or two phenomena that contain scientific truth in daily life
- 17. On the strange phenomenon of desert Over the past 40 years, mankind has gained a lot of new knowledge about deserts. What are the strange phenomena in deserts? Can we explain these strange phenomena with scientific principles?
- 18. What are the wonders of nature
- 19. Write a composition about the strange landscape formed by nature
- 20. Strange phenomena in life? It must be based on facts