symmetry
A pentagon is a polygon with 5 sides and 5 angles.
A quadrilateral is the general term for figures with four sides. A kite, rhombus, trapezoid are all examples of quadrilaterals which need not have any right angles. (A rhombus cannot have any)
A quadrangle with all sides equal and no 90 degree angles is a rhombus
An octagon has eight sides. The term "octo" means eight, which is reflected in its geometry. Octagons can be regular, with all sides and angles equal, or irregular, with varying lengths and angles.
A quadrilateral is the general term for a 4 sided polygon.parallelogram, which is not a rectangle, would fit this.Several trapezoids would fit this description, as well.A kite with no right angles, fit this as well.A rhombus can fit this description as well.
A parallelogram can have four equal sides that will not meet at right angles. The term diamond can also be used in this context.
similar
A regular pentagon. A regular pentagon has five sides of equal length and its five angles are also equal. The term regular implies the notion of equal sides and equal angles.
It is a Rhombus.
Such triangles are similar.
A plane figure having four sides and four angles
A shape with 11 sides and 11 angles is called a hendecagon or undecagon. The term "hendecagon" comes from the Greek words "hendeka," meaning eleven, and "gonia," meaning angle. This polygon can be regular, where all sides and angles are equal, or irregular, with varying side lengths and angles.