an equilateral triangle
They may not be. Consider a rectangular cuboid. This is a solid six sided object that does NOT have all sides equal. Some cuboids certainly do have all sides equal.
A square is a four-sided shape with all sides equal and all angles equal.
Eight sided closed figure with equal length of all the sides is called Octagon. Measure of every angle of Octagon is 45.
A pentagon is a five sided two-dimensional object. A regular pentagon would have all five sides and angles equal.
A four-sided form in which all sides are equal and all angles are equal.
If all of the sides are equal and it is a four sided figure then it is either a rhombus or a square. If all of the angles are also equal then it is a square.
It is an irregular 7 sided heptagon.
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 isn't really a square if it has no equal sides. A trapezoid can be drawn that has no equal sides, some can have two sides equal. Quadrilaterals include those 4-sided shapes with no sides equal but they also include all other 4-sided shapes. You would need to specify "Quadrilateral with no equal sides".
hexagon
A square
A four sided, regular polygon with all sides and all angles equal.Also : a rectangle with all four sides equal.It is a 4 sided regular quadrilateral having 4 equal sides and 4 equal interior angles