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It's quite acceptable to call them 11-agon or 30-agon but what's more important is knowing how to work out their properties.
Convex polygons with congruent sides and congruent angles are called regular polygons.
The sides of a polygon do not generally have specific names. Polygons with 3 sides are triangles.
They are called regular polygons
hendecagon
A polygon with 5 sides is called a pentagon.
Convex polygons with congruent sides and congruent angles are called regular polygons.
The sides of a polygon do not generally have specific names. Polygons with 3 sides are triangles.
They are called irregular polygons
They are known as regular polygons.
They are called regular polygons
Triangles
hendecagon
A polygon with 5 sides is called a pentagon.
Shapes with straight sides are called polygons
Quadrilaterals are polygons with four sides. Triangles are polygons with three sides.
They are called polygons.
Regular polygons