How to quickly specify previous point ?

Sometimes we need to copy object; sometimes we need to connect line, arc and polyline with newly-created object,

we can use snap, but there is an easier way.

How to connect arc, line and polyline with newly-created object

When we finish an arc and want to draw a line that connect with the arc or we just want to continue with our drawing after accidentally exiting the command without finishing drawing, the most common way is to use snap to track the endpoint, but there is an alternative way.

Press Enter key, the CAD system will automatically track the endpoint of line, arc or polyline.

For example, when we draw a line after an arc, just pressing Enter key will not only connect with the arc but also get the tangential direction, as shown in the following,