It is a circumcircle or circumscribing circle.
Yes
all sides are the same
apolygon is a shape that has no curves ,is closed, and has more then three sides
The Antarctic Circle is the region in the Southern Hemisphere surrounding the South Pole.
A polygon with 11 sides is called an "undecagon."
A trapezoid
6 sides
The radius is always at a fixed, unchanging distance from the center of a circle to all the surrounding points.
a circle surrounding a star
The number of sides and vertices are the same
No, a cube is a 3 dimensional shape. All polygons are 2 dimensional.
A two dimensional shape with 3 sides or more is considered to be a polygon