A square is a four-sided shape with all sides equal and all angles equal.
an equal sided triangle
It is equal on both sides so there is no difference between the sides !!
quadralateral
triangle
a quadrilateral
A regular 8 sided octagon has eight equal sides.
A 7-sided shape is a heptagon.If all the sides are of equal length and the angles are all equal then it is known as a regular heptagon.
It is an irregular 7 sided heptagon.
A scalene triangle.
A parallelogram is a four sided shape where opposite sides are parallel and equal lengths. If you mean that ALL sides are equal lengths, you are looking for a rhombus.
A heptagon or a septagon. Equal-sided shapes are called "regular" so a seven equal sides shape is a regular heptagon.square square