As many corners as sides.
no
Yes.
Hexagon
a polygon is convex
If the polygon (not ploygon!) has n vertices, the sum of the angles is (n-2)*pi radians or (n-2)*180 degrees.
as many as it wants
170
no
Yes.
20
Hexagon
A triangle.
No, it's a POLYGON.
a megcagon
PENTAGON!!!
a tetradecagon
heptagon