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
A shape with six unequal sides is called a hexagon. While a regular hexagon has all sides equal, an irregular hexagon features sides of different lengths. The term "irregular hexagon" is used to describe any six-sided polygon with unequal side lengths.
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.