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Any square unit you like can be used to measure the area of a postcard, however to make the numbers have a reasonable size and ease of handling, I would suggest using square centimetres as a postcard is about hand size (and likely to be about 15cm by 10cm).

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12y ago
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14y ago

cm's centimeters

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12y ago

grams

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Q: Which metric unit would you use to measure an postcard?
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