How to add a straight line to a square without an angle to make the figure become two triangles

It's just a brain teaser, not a math problem
Just make a thick line from the broken line width at the missing corner
But in fact, this is not in line with the mathematical principle of no thickness line

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1. How to divide a square into two triangles with a line by eliminating an angle
2. How can you draw a line to make two triangles when you remove a corner from a square,
3. As shown in the figure, it is a figure composed of five squares with side length of 1. If the area of a square is equal to the area of the figure, try to find the side length of the square
4. As shown in the figure, it is composed of five squares with side lengths of 2, 3, 4, 5 and 6. Please think about it. If you add a square to the figure, it will appear at most______ It's a square
5. As shown in the figure, it is composed of five small squares with side length of 1. If you cut them arbitrarily (not necessarily along the side line of the small square), you can put them together. (1) can you make a rectangle? If yes, please draw a sketch. (2) can you make an isosceles triangle? If you can, please draw a sketch (3). Can you make a square? If you can, please make a sketch
6. As shown in the figure, it is composed of five small squares with side length of 1. If you cut them arbitrarily (not necessarily along the side line of the small square), you can put them together. (1) can you make a rectangle? If yes, please draw a sketch. (2) can you make an isosceles triangle? If you can, please draw a sketch (3). Can you make a square? If you can, please make a sketch
7. Figure 18-48 is composed of five square pieces of paper of the same size. Please cut two pieces of paper on the figure and then make a square
8. Here are five small squares. Can you cut this figure two times and divide it into three parts? Can these three parts make a square? Three in the middle, one on the left and one on the right
9. Tiantian uses 24 pieces of the same square to make a rectangle, which can make () different rectangles (length a, width B and length B, width a are one) Detailed steps to add good points
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11. One by one, a square is missing a corner, how to add a line to become a 2 triangle
12. How to draw a square with four strokes and add a small square inside ----------
13. How many strokes does the word Dou have
14. What is the stroke order of Dou
15. What is the stroke order rule of "dou"? What is the stroke order rule?
16. The stroke order of the upper part of the word "dou" is "--" before "--"
17. What are the strokes and order of the characters in Dou?
18. How to write the stroke order of Tibetan characters? How many strokes are there?
19. What are the 20 strokes
20. In Chinese characters, how many characters have one stroke?