You can draw a circle or square using the elliptical or rectangular marquee tools, and then add a line (called a stroke) to the selection marquee. Stroking a selection is a quick way to add a border or frame around an object. You can stroke any selection you create with the selection tools.
to
create a new layer for the circle or square. Isolating the circle
or square on its own layer makes it easier to work with.
or
the Rectangular Marquee tool
in the
toolbox.