As many sides as you like providing that it has 3 or more equal sides and equal interior angles
with all sides equal (congruent) AND all angles equal (congruent). In these circumstnces the adjective "convex" is redundant.
a regular polygon
Regular polygons have congruent sides and angles
That's a regular polygon.
Any regular polygon
The answer is in your question it is defined to be a regular polygon as for example an equilateral triangle
congruent; congruent
a "regular" one
A regular polygon is a polygon with congruent sides and interior angles.
with all sides equal (congruent) AND all angles equal (congruent). In these circumstnces the adjective "convex" is redundant.
It is an equilateral polygon. It is not a regular polygon. For the polygon to be regular, it is not enough for the sides to be congruent: all the angles need to be congruent as well.
No. You also need all of the sides to be congruent. For example, a rectangle has four congruent angles, but it is not a regular polygon.
A polygon with all sides congruent is a square.
A regular polygon
That is called a regular polygon.
It is a regular polygon
a regular polygon