All regular polygons have equal sides.
In addition there are others, such as a rhombus, which also have equal sides but are not regular because their angles are not all the same. There is no generic name for such "squashed" polygons.
A shape that does not have equal sides is called an irregular shape.
The shape that has not got equal side is a rectangle
Here are three: equilateral triangle, square, and cube
It is polygon but this type of shape is a nonagon.
it has to have equal angles, not side lengths. otherwise it would just be two of the same shape
The answer depends on what shape the question is about.
An isosceles triangle is one of them
Pentagon ,,,, 180 digr
square
An isosceles triangle has two equal sides and one different side.
regular pentagon maybe maybe not
An EQUILATERAL TRIANGLE