Word 2007: How to Change Paper Size
You can change the paper size of your document through the Page Layout tab, Page Setup group. Clicking the Size button will give you a list of preset paper sizes.
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If none of those presets fit your needs, you can create a custom paper size by choosing the More Paper Sizes at the very bottom of the Size list. It will open the Page Setup box, where you can set a custom paper size through the Paper tab’s Paper size section. The list of preset page sizes is the same as the list in the Size button.
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