Drawing a rectangle or square
Drawing rectangles is similar to drawing straight lines, except that you use the Rectangle icon
from the Drawing Toolbar. The (imaginary) line drawn with the mouse corresponds to the diagonal of the rectangle. In addition, the outline of the future rectangle changes shape as you drag the mouse around. The outline is shown as a dashed line until you release the mouse button, when the rectangle is drawn.
Drawing a rectangle
Hold down the Shift key to draw a square. Hold down the Alt key to draw a rectangle starting from its center. To combine the effects, hold down both the Shift and Alt keys simultaneously.