According to the theorem that the distance from the bisector to both sides of the angle is equal, on the other hand, points with equal distance to both sides of the angle constitute the bisector. According to the above analysis, you use two vertical sides of a triangle to draw a picture, so that one of the right-angled sides coincides with one side of any angle, and the non-right-angled vertex of the triangle coincides with the vertex of any angle. Draw a straight line, and the straight line is perpendicular to one side of any angle. Turn the triangle upside down and draw a vertical line on the other side. The intersection of two vertical lines is the point on the angular bisector. Connect the intersection with the vertex of any angle to get the bisector of the angle.