(i) By welding you can create irregular shapes.
(ii) The welded objects take on the outline and fill of the object that was selected last.
(iii) Welded objects can revert to their original individual objects only by using the Undo button.
To weld objects sing Property Bar
(i) Select the objects with the Pick tool by holding the Shift key.
(ii) Choose Object > Shaping > Weld in the menu bar (or)
(iii) Click on Weld button on the Property bar.
(iv) The objects will be welded and will become a single outline object.

To fill colour to any object:
(i) Select the object using the Pick tool.
(ii) Click on any colour on the Color palette.
(iii) The selected colour will be applied to the object.
(iv) Right click on any colour on the Color palette.
(v) The outline colour of the selected object will change to the selected colour.

To specify the Undo settings
1. Choose Tools > Options in the menu bar.
2. In the Workspace list of categories, click General
3. In the Undo levels area, type a value in one or both of the following boxes:
(i) Regular - specifies the number of actions that can be reversed when you use the Undo command with vector objects.
(ii) Bitmap effects - specifies the number of actions that can be reversed when you work with bitmap effects.
The keyboard shortcut is
(i) To Undo an action, press Ctrl + Z.

There are two types of spirals. They are
(i) Symmetrical spiral:
 A Symmetrical spiral expands evenly so that the distance between each revolution is equal.
(ii) Logarithmic spiral:
 A Logarithmic spiral expands with increasingly larger distances between revolutions.

Drawing a Rectangle
(i) To draw a rectangle, select the Rectangle tool in the toolbox. The mouse pointer changed to a crosshair with a small rectangle beneath it.
(ii) Click and drag anywhere in the drawing area. As you drag, a rectangle appears.
(iii) Release the mouse button when the rectangle is of the desired size.
(iv) Now a rectangle will appear on the screen.