parallelogram
A square is a four-sided polygon with two congruent parallel sides.
A four-sided polygon with opposite sides parallel and all sides congruent is a square.
A square or a rhombus
That depends somewhat on other characteristics of the polygon.-- If it has four sides and one pair of them is parallel and congruent, then theother 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 beparallel, and it's called a rhombus.-- If it has four sides and both pairs of sides are parallel and all four are congruentand 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 oppositeparallel 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 four sided polygon with two pairs of parallel sides is called a Parallelogram.
parallelogram
A square is a four-sided polygon with two congruent parallel sides.
A four-sided polygon with opposite sides parallel and all sides congruent is a square.
Any polygon with four or more sides can have parallel sides.
A four-sided polygon with all sides parallel and congruent is a rhombus. If all the angles are equal, it is a special case of a rhombus called a square.
quadrilateral
A square or a rhombus
A four-sided polygon with two parallel sides is called a trapezoid (US) or trapezium (UK). It requires that the parallel sides are not equal in length, or they would form a parallelogram. A trapezoid's bases are parallel, but the legs are not.trapezoid
That depends somewhat on other characteristics of the polygon.-- If it has four sides and one pair of them is parallel and congruent, then theother 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 beparallel, and it's called a rhombus.-- If it has four sides and both pairs of sides are parallel and all four are congruentand 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 oppositeparallel 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 four-sided polygon with opposite sides parallel could be a square, a rectangle, or a rhombus.If it has one pair of opposite, parallel sides, then it is a trapezoid. If it has two pairs of opposite, parallel sides, then it is a parallelogram.
NO!!!! A parallelogram is a polygon of four sides. The opposite sides are parallel and equal in length.