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Which of the following patterns are obtained by rotation?
No one has answered for such a long time. Let me answer
The first figure is not axisymmetric, the other three are axisymmetric
If the second figure is a square, it is also correct to draw the axis of symmetry in this way. It is better to draw it vertically in the middle, which is more stable. Even if it is not a square, it can also show that the rectangle is symmetrical
Fourth, since the title says "the figure below", we will regard it as a figure instead of a pattern. When a vertical axis of symmetry is drawn in the middle of it, it is also left-right symmetrical
The first pattern is obtained from the "petal" pattern through rotation
The second pattern is obtained by rotating the "leaf" pattern
The third pattern is obtained by rotating the "Cross Star" figure
The fourth pattern is obtained by the rotation transformation of the "regular triangle with points" figure
The fifth pattern is obtained by rotating the "Crescent" figure
The distance from the corresponding point to the center of rotation in a figure and its figure obtained by rotation______ The angle formed by the line between the two groups of corresponding points and the center of rotation______ ．
In a figure and the figure obtained by its rotation, the distance from the corresponding point to the center of rotation is equal, and the angles formed by the lines between the two groups of corresponding points and the center of rotation are equal
The concept of celestial body and celestial system
Celestial bodies can be understood as individuals, such as the earth, such as the sun, but celestial system refers to a regular whole composed of some related celestial bodies, such as the solar system, such as the Milky way, such as Andromeda galaxy
What does the king of celestial bodies mean
[King of celestial body] = = kongka king, honorific name. Celestial body, the abbreviation of Tianhe Sports Center, the home of Evergrande by fans. [related background] in July 2011, Evergrande, who spent a lot of money on football, dug up MVP kongka of Brazil League. The transfer fee of US $10 million was the highest value of Chinese Super League players at that time, and the annual salary of US $7 million was enough to make most of them
What is the definition of celestial bodies? Are galaxies celestial bodies?
People on the earth generally call objects outside the earth's atmosphere as celestial bodies. For example, the moon, seven planets other than the earth, the sun, asteroids, comets and so on are all objects closer to our earth. Of course, there are many nearest man-made objects in the sky - man-made satellites
In a celestial system, some celestial bodies act as central celestial bodies, and some celestial bodies rotate around the central celestial body, which may depend on their respective ()
Quality
What is the relationship between people's daily work and rest time in one day and the earth's rotation? It is the accurate time of the earth's rotation
The earth's rotation is about 24 o'clock. The exact time of the earth's rotation is 23 hours 56 minutes 4 seconds, so it is not the exact time of the earth's rotation
What is the relationship between people's daily life and work and rest time in one day and the earth's rotation?
But 24 hours a day is not an rotation cycle. Our day is actually a day and night cycle, which is caused by the earth's continuous rotation from west to East
What is the time of the earth's rotation?
By content
24 hours is a day
The time of one revolution of the earth
Does the earth rotate 365 days a week
No, how many days
One day, 23 hours, 56 minutes, 04 seconds to be exact
The revolution is 365 days, or 365.2422 days to be exact. Therefore, for the convenience of calculation, it is a leap year to calculate one more day every four years. But remember, it is not a leap year, the earth's revolution is 366 days, which is easy to be wrong~
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