That depends somewhat on other characteristics of the polygon.
-- If it has four sides and one pair of them is parallel and congruent, then the
other pair must also be parallel and congruent, and it's called a parallelogram.
-- If it has four sides, parallel and congruent opposite sides, and a right angle,
then it's called a rectangle.
-- If it has four sides and all four sides are congruent, then opposite sides must be
parallel, and it's called a rhombus.
-- If it has four sides and both pairs of sides are parallel and all four are congruent
and it has a right angle, then it's called a square as well as a rhombus.
-- Any polygon with more than four sides can have at least one pair of opposite
parallel congruent sides and possibly more, but doesn't necessarily have.
-- If it's a regular polygon, then it has one or more such pairs of sides if, and only if,
it has an even number of sides.
-- In any case with more than four sides, the polygon is named for its number of sides.
And I believe that pretty well covers it.
A square or a rhombus
No, it is not true that in a polygon all sides and angles are congruent. A polygon with all sides congruent is called a regular polygon, but there are also irregular polygons where the sides and angles can vary. For example, a rectangle has congruent opposite sides but not all sides are equal, and its angles are congruent but not all angles need to be equal in other types of polygons. Thus, congruence in sides and angles only applies to regular polygons.
A regular polygon.
A regular pentagon
That would be called a regular polygon, one with congruent(equal) side legnths and congruent angles.
That is called a regular polygon.
It is called an irregular polygon. However, an irregular polygon can have congruent sides if all angles are not equal.
A square or a rhombus
It is called a regular polygon. * * * * * Actually not. All its angles must also be congruent for it to be called regular.
an irregular polygon
A regular polygon.
A regular pentagon
rectangle
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That would be called a regular polygon, one with congruent(equal) side legnths and congruent angles.
Congruent
All its angles are of the same measure and all its sides are congruent.