trapezoid
A polygon with 2n sides (n>1) can have opposite sides congruent.
A four-sided polygon with opposite sides parallel and all sides congruent is a square.
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 polygon with five congruent sides is a pentagon.
It all depends on what kind of polygon it is. It may have no congruent sides or all congruent sides.
A polygon with 2n sides (n>1) can have opposite sides congruent.
A four-sided polygon with opposite sides parallel and all sides congruent is a square.
Any polygon with an even number of sides can have opposite sides that are congruent and parallel.
A polygon with 2n sides (n>1) can have opposite angles congruent.
Any polygon with 2n sides (n integer) where opposite sides are parallel, will have its opposite angles congruent.
a trapezoid
A square
polygon
A rectangle is a quadrilateral with opposite sides parallel and congruent and four right angles. If all four sides are congruent, it is a square.
A rectangle is a quadrilateral with opposite sides parallel and congruent and four right angles. If all four sides are congruent, it is a square.
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 polygon with five congruent sides is a pentagon.