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How many interior angles does an undecagon have? A.) 7 B.) 9 C.) 11 D.) 110
A polygon with n sides always has n interior angles.
The answer isn't 7 because that's a heptagon or septagon.
The answer isn't 9 because that's a nonagon.
It isn't 110 because there is no name for a 110-sided polygon.
Hint: In the word "undecagon" the "un" means "one" and the "deca" means "ten". What is one plus ten?