Draw a line segment;

Draw arcs on both sides of the line segment with the two ends of the line segment as the center and the length greater than half of the line segment as the radius;

Just connect two arcs at two points.

Method 2:

Choose two points as the center of the circle and draw two intersecting circles with appropriate radius;

Connect two centers of the circle;

Connect two intersections.

That is, get a right angle.