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How to draw the formula of mathematical ruler in the second volume of senior one?
The drawing method is as follows:

1. First, draw two parallel line segments with a certain width apart in the vertical direction.

2. Thirdly, connect the two ends of two parallel lines with a ruler.

3. Then draw small scale lines at equal intervals in the horizontal line segment above.

4. Finally, apply yellow evenly on all the painted rulers, and the simple ruler will be drawn.