It depends on the shape, whether or not it is regular, etc.
An octagon.
It is a rhombus or a parallelogram.
to calculate square feet you need a 2d shape
There is no such shape. A 2d shape with 5 sides and all equal angles must be a regular pentagon (or a 5-pointed star if you stretch the definition of "all angles"). And a regular pentagon - or star - has 5 lines of symmetry.
kite :)
a triangle
octagon
A square
a square
A heptagon.
An octagon.
It is a rhombus or a parallelogram.
a irregular polygon and rhombus
A 2D square □
a shape that's sides a not the same length and angles are not the same degree
A cone has no acute angles because a cone is a 3D shape and not a 2D.
There is no such shape. A 2d shape with 5 sides and all equal angles must be a regular pentagon (or a 5-pointed star if you stretch the definition of "all angles"). And a regular pentagon - or star - has 5 lines of symmetry.