Polyline

  Use the Polyline tool to draw a multisided figure.  You click
  to specify a corner, and you double click to complete a shape.
  When you complete a shape, the polyline ends and you can
  begin another.

  You can shift-click for 45-degree or 90-degree angles.

  Note that clicking near the starting point of the polyline closes
  the polygon and completes the shape.