"Plant in a 10' circle" - is that radius or diameter?

Fairfax, VA(Zone 7a)

They say there are no stupid questions, but this one is pretty close. I have a bunch of gardening books that say e.g. medlars should be planted in a 10' circle. Do they mean radius or diameter? In other words, should my medlars be only 10' away from each other (5' radius), or should they be 20' away?

Durhamville, NY(Zone 5b)

This plant file ( http://davesgarden.com/guides/pf/go/53309/ ) shows 20' to 30' spacing.
This on says 20 foot crown. http://davesgarden.com/guides/articles/view/376/
This one http://apps.rhs.org.uk/advicesearch/profile.aspx?pid=131 says 15'

So I think that is 20' diameter.

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