Resizing a chart
After you make a chart, you can resize it. To resize, drag the handle of the chart with your mouse.
Whenever you resize the chart, a new GIF file of the chart will be generated. Therefore, the chart image never gets distorted. However the title, X/Y axis title, legend, thickness of lines, etc does not change. So, you have to adjust them separately: use the Chart Formatting Tab of the Chart Properties dialog box.
Resize the chart
If you select the chart with you mouse, 8 handles will appear. Select one of those handles, and drag it to the size you want.
When you drag a resize handle, the changed size of the chart is shown in the popup box. The size format shown in th popup is WidthXHeight (%).