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, 02:13, April 16, 2007
"Tautology" has two definitions, one philosophical, one rhetorical.
The current article confounds the two definitions.
From Miriam-Webster, rhetorical tautology is defined as "needless repetition of an idea, statement, or word".
The triangle example given is not a tautology, but a definition. An example of a rhetorical tautology would be, for instance, a "godless atheist".
From Dictionary.com, a philosophical tautology is:
a.a compound propositional form all of whose instances are true, as “A or not A.”
b.an instance of such a form, as “This candidate will win or will not win.”