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When you resize most types of graphics, the same very basic principle is at work: You select the image, and then position the pointer over a resize handle at the top, bottom, sides, or corners of the image. When the pointer becomes a double-headed arrow, you drag to resize.
As you can see in the picture on the left, the pointer becomes a double-headed arrow for all types of graphics. But there is some variation in how the resize handles look from one image type to another, though they all resize in the same way. When they are selected: