A general quadrilateral: it has no specific name.
The general name for a plane shape with four sides is a quadrilateral.
In a 3D world with 6 sides it is a cube.
A quadrilateral is a shape that has four sides and has 13 letters in its name.
There is no specific name, except in the case of a triangle: scalene. You should not call it simply an irregular polygon, because a regular polygon implies that ALL sides are equal and ALL angles are equal. So a rhombus, where all four sides are equal, is still irregular.
A pyramid.
A general quadrilateral: it has no specific name.
If you meant a shape then it could be a square or a rhombus
The name of the shape is a quadrilateral.
The general name for a plane shape with four sides is a quadrilateral.
There is no name for such a figure. Quadrilaterals such as a trapezium or kite or even one with no equal sides can have a right angle.
It is usually a regular polygon that has equal sides.
If it has four equal sides, it is a parallelogram. If the angles are also equal, it would be a square.
Parallelogram is a quadrilateral with opposite sides both parallel and equal in length - commonly known as a rectangle.
Square. By definition, its sides must all be equal.
parallelogram
irregular