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Is a axisymmetric figure
A is not an axisymmetric figure
Is 3 an axisymmetric figure
Is an axisymmetric figure, the axis of symmetry should be a horizontal line in the middle of "3"
What are the axisymmetric figures in life
Be sure to draw pictures
Bees, dragonflies, butterflies, cars, maple leaves, facial makeup, paper
Figure in Baidu pictures search (play axisymmetric graphics) slowly find
Why do you use axisymmetric graphics in your life?
There are many cases out of the need for center of gravity balance, such as cars, aircraft, must be axisymmetric to prevent rollover
Others are just for beauty, such as pentagram
What are the axisymmetric figures?
There is one line in the line
There is one corner;
There is one isosceles triangle;
There are three equilateral triangles;
There are two rectangles;
There are four squares;
An isosceles trapezoid has one
There are two diamond shapes
The semicircle has one
There are countless lines in the whole circle
There are five five five pointed stars
There are six regular hexagons
There are seven regular heptagraphs
wait
As shown in the figure, a square piece of paper with side length of 1 is divided into seven parts, Part 2 is half of the area of Part 1, and Part 3 is half of the area of Part 2
As shown in the figure, a square piece of paper with side length of 1 is divided into seven parts. Part 2 is half of the area of Part 1, Part 3 is half of the area of Part 2, and so on. The corresponding area is part (7)
(1) What is the area of the shadow?
(2) Inspired by this, you can find 1 / 2 + 1 / 4 + 1 / 8 + +1 / 2 to the sixth power
The area of the shadow is:
One sixth of 2,
1/2+1/4+1/8+… +1 / 2 to the sixth power = 1
As shown in the figure, it is known that the sum of the areas of No. 1 and No. 4 squares is 7, and the sum of the areas of No. 2 and No. 3 squares is 4, then the sum of the areas of a, B and C squares is ()
A. 11B. 15C. 10D. 22
By using Pythagorean theorem, we can get SA = S1 + S2, sb = S2 + S3, SC = S3 + S4, ∩ SA + sb + SC = SA = S1 + S2 + S2 + S3 + S3 + S4 = 7 + 4 + 4 = 15
As shown in the figure, it is known that the area ratio of a and B in a square is 2:3, and the area ratio of a and C is 6:7. If the area of D is 15 square centimeters, find the side length of the square
A and B (2 × 3): (3 × 3) = 6:9a and C 6:7 A: the area ratio of a, B and C is 6:9:7.2, if the area of D is 15 square centimeters, find the side length of the square. 15 (6 + 9-7) = 15 (8) = 1.8751.875 × (6 + 9)
There are two squares in the figure. The area values of the two squares are just composed of six numbers 2, 3, 4, 5, 6 and 7. So what is the area of the small square______ What is the area of a large square______ ．
It can be seen from the figure that the area of a large square is twice that of a small square. The test shows that 273 × 2 = 546. Answer: the area of a small square is 273, and that of a large square is 546. So the answer is 273; 546
As shown in the figure, the area ratio of a and B is 2:3, and the area ratio of a and C is 6:7
1. Find the ratio of the three parts of ABC. 2. If the area of D is 15 square centimeters, find the side length of the square
1、A：B=2：3=6：9,
A：C=6：7,
That is, a: B: C = 6:9:7
2. Side length = square root of open 15. 15 ^ 2
RELATED INFORMATIONS
- 1. 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
- 2. 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
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- 4. AB = ad ∠ ABC = ∠ ADC, AC and BD intersect at point O. it is proved that AC is the vertical bisector of BD
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- 6. 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
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- 8. 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
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- 10. 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______ ．
- 11. Draw two circles to make the figure have two symmetrical axes
- 12. What time is it
- 13. List one or two phenomena that contain scientific truth in daily life
- 14. 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?
- 15. What are the wonders of nature
- 16. Write a composition about the strange landscape formed by nature
- 17. Strange phenomena in life? It must be based on facts
- 18. The following phenomenon belongs to translation transformation () 1. The rolling of football on the morning ground; 2. The swing of pendulum; 3. The movement of bottled drinks on the conveyor belt
- 19. (translational) The following motions are not translational: A. The slip of a car on the ground when it brakes sharply B. The plane accelerated on the runway before taking off C. The movement of a kite in the air D. The cable car movement in the mountains
- 20. The two elements of graphic translation are and Completion