Form an arc

Midline: Make two circular arcs with compasses at both ends of one side as the center and any length as the radius, pass through both sides of the corner, then make two circular arcs with the intersection as the center, find the intersection of the two circular arcs, connect the two intersection points through the edge, and connect this point with another endpoint, which is the midline.

Height: use compasses to make two circular arcs with arbitrary length as the center, pass through the two sides of the corner, then use intersection as the center to make two circular arcs, find the intersection of the two circular arcs, connect the two intersection points, make a parallel line through the other endpoint, which is called a point on the line where the edge is located, and connect this point with the other endpoint, which is the high line.