Changes

From Miriam-Webster, rhetorical tautology is defined as "needless repetition of an idea, statement, or word".

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".

The triangle example given is not a tautology, but a definition.  An example of a rhetorical tautology would be, for instance, a "godless atheist", or a "three-sided triangle" (as opposed to "a triangle has three sides".

From Dictionary.com, a philosophical tautology is:

From Dictionary.com, a philosophical tautology is:

a.a compound propositional form all of whose instances are true, as “A or not A.”

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.”

b.an instance of such a form, as “This candidate will win or will not win.”