If a quadrilateral with four congruent sides is not regular. Then the quadrilateral will be a rhombus.
It is a polygon that has four sides. The sum of the internal angle is 360 degrees. In a rhombus, opposite sides are parallel and all sides are equal and each angle is not 90 degrees.
A quadrilateral with four congruent sides is not regular.
If the sides of the quadrilateral are congruent then the quadrilateral must be either square or rhombus.
But if the sides are not regular then it must be a rhombus.
More about the rhombus link is given below.
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