Angle bisector: first draw an angle with the vertex as the center and the appropriate length as the radius, and the radius is not greater than the side length of the angle. The intersection of the drawn arc and the two sides is A and B, and then take A as the center, an appropriate length as the radius, and A as the center, and then take this as the center. The intersection of two lines is connected with the vertex of the angle, and the vertex of the angle is the bisector of the angle.

Middle vertical line: draw a line segment, draw an arc with the end points on both sides of the line segment as the center (the arc is more than half of the circle), and then connect the upper and lower intersections of the line segment, which is the middle vertical line.