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By inputting

Portugal shape area, China shape area

to Wolfram|alpha I can get two country shapes, but how can I get them on top of each other at the same scale? The output I'm looking for is what you get from Mapfight.

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Are you trying to do this from within WolframAlpha? What are you looking for that's different from a Portugal v China Mapfight? – batpigandme Jun 4 '13 at 22:27
Yes, within WolframAlpha. I'd like to use WolframAlpha's shapes as they are significantly more detailed than Mapfight's. For example, South Korea vs. Taiwan mapfight and wolfram alpha. – Gareth Jun 4 '13 at 23:22

W|A can evaluate some "arithmetic expressions" composed of property values of multiple entities. Some examples include

To compare same property of two entities, doing division and/or subtraction seem the way to go.

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