Tools

So far JS-CAD has a very rudimentary toolset. The tools are 'point,' 'line,' 'rectangle,' 'circle,' 'arc,' 'trim,' and 'delete.'

So far the only way to create a circle is by center-point.

Arcs are drawn counterclockwise.

The Trim tool removes all other segments of an entity, or removes the hilighted segment. Just draw a circle and a line through it and trim either entity.