A3 Format | A3 paper size & Uses | A-Series Paper | Adobe
https://www.adobe.com/uk/creativecloud/design/discover/a3-format.html
WebA3 is a versatile and popular paper format in the ‘A’ series, ranging from A0 to A10. It’s twice larger than A4 and ideal for posters, signs, folded leaflets and menus. Learn how to print, …
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