1. Are the inside angles of all hexagons equal to 120o?

Only if it is a regular hexagon. This is a hexagon with all sides of equal length.

2.What is a REGULAR polygon?

REGULAR polygon is a polygon with sides of equal length and angles of equal size.

3. Is it possible for a polygon to have an interior angle greater than 180o?


Yes. This type of polygon is called a

concave polygon.

4. How are the outside angles of a regular polygon, such as an octagon, calculated?

The outside (exterior) angles of any polygon always add up to 360o
For a regular octagon, each of the eight exterior angles is 360
o divided by 8 = 45o

5. Are there special names such as HEXagon for all polygons?

No, once we get pass the 12-sided dodecagon, we start writing them like this 13-gon, 14-gon etc.