say n is the number of sides in the polygon
then 360/n is the number of degrees in the central angle for the triangles that make up the n-gon.
then 180-(360/n) is the number of degrees in each triangle that are part of the angle counts.
there are n triangles.
so 180(n-2)
sanity check says it works for triangles and quadrilaterals, so its probably good.
A hexagon is a poloygon.
A nonagon.
A Pentagon
a regular shape which includes many sides possible but all sides are equeal in length
A hexagon.
Heptagon or septagon
a poloygon that does not curve or cross and is closed
It's the other way around . . . a pentagon is one of many kinds of polygon. In fact, "Poly" actually means 'many'.
45
9
A square
360 /each exterior angle