The polar coordinate system locates points by defining the distance and angle from the previous point. Because this is measuring relative to the last point, the @ is required. Then the distance from the last point is specified, followed by a < and then the angle to the point. Remember, all angles in AutoCAD are measured counter clockwise from the positive horizontal axis.

Entry Format: @distance<angle

line ENTER

0,0

@50<0

@50<120

@50<240 *The side length is the same since this is an equilateral triangle (all interior angles are 60 degrees)*

ESC