Question 4298
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?

Edwin