Is a mathematical term, which means that two or more equations have equal ratios. In a proportion, the product of two external terms is equal to the product of two internal terms, which is called the basic property of proportion.
In mathematics, if the change of one variable is always accompanied by the change of another variable, then these two variables are proportional. If these changes are always linked by a constant multiplier, then this constant is called a proportional coefficient or a proportional constant.
The ratio of China people to the national flag is 3:2.
2. Measurement of length and width
The measurement of length is the most basic measurement, length refers to the scale of space, and the most commonly used tool is scale.
The international unit of length is meter (m), and commonly used units are kilometer (km), decimeter (dm), centimeter (cm), millimeter (mm), micron (micron) and nanometer (nm). When converting length units, small units are converted into large units by multiplication and large units are converted into small units by division.
China's national flag size is divided into six specifications (mm):
1, 2880× 1920;
No.2, 2400×1600;
No.3,1920×1280;
No.4,1440× 960;
No.5, 960× 640;
No.6, 660× 440;
3. Symmetry
Is a regular repetition of the same part of an object. Crystal has symmetry, which is manifested in its appearance, crystal surface, etc., and its edges and corners appear regularly. Crystal is symmetrical because it is different from other objects.
(1) To determine the position of the five stars, first divide the flag surface into four equal rectangles, divide the upper left rectangle into ten equal parts from top to bottom, and divide the left and right into fifteen equal parts.
(2) The center of the five-pointed star is at five points, five points on the left and ten points on the rectangle. Its drawing method is: take this point as the center and make a circle with the radius of three divisions.
On this circumference, five equidistant points are determined, one of which must be directly above the circle. Then connect the two points separated by these five points to make them into a straight line. The outer contour formed by these five straight lines is the required five-pointed star. One corner of the five-pointed star is facing up.
(3) The center points of the four small five-pointed stars, the first point is on the rectangle, the second point is on the rectangle, the third point is on the rectangle, the third point is on the rectangle, and the fourth point is on the rectangle.
Its drawing method is as follows: the above four points are the center of the circle, and each point is divided into four circles with equal radius. Set five equidistant points on each circle, one of which must be located on the connecting line between the center of the five-pointed star and each of the above four centers.
Then use the same method to form a big pentagram and a small pentagram. Four small pentagrams, each with an angle pointing directly to the center of the big pentagram.
4. Numbers
Numbers are written symbols used to represent numbers. Different counting systems can use the same number. There are 13 red and white stripes on the American Stars and Stripes, which originally meant to represent 13 states in the United States. Later, it was fixed, and the stars on the national flag represented the States. There are 50 stars on the national flag, representing 50 states in the United States.
Step 5 shape
The existing form or manifestation of a specific thing or substance, such as rectangle or square, geometric parameters such as shape, volume and surface area.
The shape of the national flag is mostly rectangular, but the Swiss flag is square with a white cross in the middle, which symbolizes national unity and dedication to public interests. The tail of Nepal's national flag is the right corner of the top of two triangles, representing two peaks in the Himalayas.
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