Final answer:
To activate the sizing handles on a graphic, you must first select the graphic. Once selected, sizing handles appear to enable resizing. Click and drag these handles to adjust the graphic's size while maintaining its proportions with the 'Shift' key if needed.
Step-by-step explanation:
To activate the sizing handles on a graphic within a document or an application, you must first click to select the graphic. Sizing handles are small points or squares that appear around the perimeter of a graphic that allow you to resize the image. When you click on the graphic with your mouse, the sizing handles will appear, indicating that the image is active and ready for manipulation.
To properly interact with these handles, simply place your cursor over one of the corners or edges until it changes to a two-sided arrow (often a diagonal arrow for corner handles or a vertical/horizontal arrow for edge handles). Click and drag to resize the image. Keeping the 'Shift' key pressed while dragging a corner handle helps maintain the original aspect ratio of the graphic to avoid distortion.