A square
As a 2D polygon shape it is an 8 sided octagon.
A cone has no acute angles because a cone is a 3D shape and not a 2D.
Well its still a 2d because its like a normal square
An 8 sided polygon is an octagon
An octagon.
An 8 sided octagon has 8 interior angles that add up to 1080 degrees
a triangle
A square
a square
octagon
It depends on the shape, whether or not it is regular, etc.
As a 2D polygon shape it is an 8 sided octagon.
A heptagon.
It is a rhombus or a parallelogram.
A 2D square □
a irregular polygon and rhombus