What is the name of the fourth stroke

The name of the fourth stroke is 4 horizontal fold

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3. Stroke order of long characters What is the stroke order of [long] characters
4. How to arrange the stroke order of long characters
5. In Chinese characters, how many characters have one stroke?
6. What are the 20 strokes
7. How to write the stroke order of Tibetan characters? How many strokes are there?
8. What are the strokes and order of the characters in Dou?
9. The stroke order of the upper part of the word "dou" is "--" before "--"
10. What is the stroke order rule of "dou"? What is the stroke order rule?
11. What is the name of the fourth stroke order of Chang character?
12. What is the name of the fourth stroke order of Chang character
13. Cut the four corners of a square cardboard with a side length of 4A into a square with a side length of a to make a rectangle without a cover and calculate the total area of the figure after cutting 1. Calculate the total area of the cut figure? 2. Calculate the bottom area of the cuboid box?
14. As shown in the figure, there are 1 square a, 2 square B and 3 rectangle C. please put them together into a large rectangle (draw the diagram), and use the relationship between areas to decompose the polynomial A2 + 3AB + 2B2 into factors
15. On a square paperboard with side length of 1, paste small pieces of paper with the area of half, quarter, eighth, sixteenth and twentieth power in turn. Please write down the expression of the area of the last part not pasted
16. Divide a square with an area of 1 into two rectangles with an area of half Divide a square with an area of 1 into two rectangles with an area of 1 / 2, then divide the rectangle with an area of 1 / 2 into two rectangles with an area of 1 / 4, and then divide the rectangle with an area of 1 / 4 into two rectangles with an area of 1 / 8. In this way, try to use the law revealed by the graph to calculate: 1 / 2 + 1 / 4 + 1 / 8 + 1 / 6 + 1 / 32 + 1 / 128 =?
17. As shown in the figure, divide a square with an area of 1 into two rectangles with an area of 1 / 2, then divide the rectangle with an area of 1 / 2 into two squares with an area of 1 / 4, and then divide the square with an area of 1 / 4 into two rectangles with an area of 1 / 8. In this way, try to use the law revealed by the figure to calculate: 1 / 2 + 1 / 4 + 1 / 8 + 1 / 16 + 1 / 32 + 1 / 64 + 1 / 128 + 1 / 256 = What is the area of a small rectangle obtained by the eighth equal division?
18. Chinese ancient mathematician Zhao Shuang's Pythagorean histogram is a large square composed of four congruent right triangles and a small square in the middle The area of a square is 13, the area of a small square is 1, the longer right side of a right triangle is a, the shorter right side is B, what is the value of a ^ 4 + B ^ 3
19. The two right sides of a right triangle are 6 cm and 8 cm respectively, and the hypotenuse is 10 cm. Then the height of the hypotenuse is () cm A. 2.4cm B. 4.8cm C. 9.6cm D. 1.2cm
20. The sum of the two right sides of a right triangle is 14 cm, and the area is 24 cm 2