You add the lengths of all the sides.
Normally perimeters are are only applicable to 2 dimensional shapes.
None. Edges are one lines (1-dimensional) not shapes like squares (2-dimensional).None. Edges are one lines (1-dimensional) not shapes like squares (2-dimensional).None. Edges are one lines (1-dimensional) not shapes like squares (2-dimensional).None. Edges are one lines (1-dimensional) not shapes like squares (2-dimensional).
Plain (2-dimensional), closed, convex shapes.Plain (2-dimensional), closed, convex shapes.Plain (2-dimensional), closed, convex shapes.Plain (2-dimensional), closed, convex shapes.
Polygons and 2 dimensional shapes
"2-dimensional" means "flat". Anything you can draw on paper is a 2-dimensional shape.
Polygons are a special type of 2-dimensional shapes.
You can't. Volume is only for 3 dimensional shapes. You won't find a way of using volume in any kind of 2 dimensional stuff.
2 dimensional shapes
They have one fewer dimension; they lack depth.
0
You know how 2-dimensional shapes are flat right? Well 3-dimensional means that it can go to and from you also.
3 dimensional shapes have breadth, width and depth whereas 2 dimensional shapes have only breadth and width