The description given fits that of a scalene triangle.
A quadrilateral
Trapezoid
an irregular octagon
decagon
scalene triangle
This is a special case of a quadrilateral called a rectangle.
An irregular pentagon.
pentagonImproved Answer:-An irregular pentagon
an irregular hexagon
rectangle
A shape that has four sides but does not have all sides the same length is called a trapezoid (or trapezium in some countries). In this shape, at least one pair of opposite sides is parallel, while the other sides can be of different lengths. Another example would be a quadrilateral, which can have varying side lengths and angles.
An angle is a geometric figure formed by two rays (or line segments) that share a common endpoint called the vertex. When discussing a shape with three sides of different lengths, you are referring to a triangle, specifically a scalene triangle. In a scalene triangle, all three sides have different lengths, and consequently, all three angles are also different.