Length relates to the distance between two points. Area is the width of a flat object multiplied by its height. Volume is the width times the height times the length of a 3-dimensional object.
If the bar is a three dimensional object it will have some thickness. Then, assuming it is oblong in shape and knowing its length, width and thickness: Surface_area = 2 x (length x width + width x thickness + thickness x length)
A flat surface with an infinite length and width but no depth is called a plane.
A surface that has length and width.
A two-dimensional object is an object that can be drawn on a flat sheet of paper. It's called "two-dimensional" because it has 2 dimensions . . . length and width, but no height.
Length relates to the distance between two points. Area is the width of a flat object multiplied by its height. Volume is the width times the height times the length of a 3-dimensional object.
If the bar is a three dimensional object it will have some thickness. Then, assuming it is oblong in shape and knowing its length, width and thickness: Surface_area = 2 x (length x width + width x thickness + thickness x length)
A flat surface with an infinite length and width but no depth is called a plane.
A surface that has length and width.
A two-dimensional object is an object that can be drawn on a flat sheet of paper. It's called "two-dimensional" because it has 2 dimensions . . . length and width, but no height.
first of all its AREA, and you can find it several ways all depending on what the shape of the object is, but for anything that is some sort of rectangle, and flat, it is Length x Width, and for any rectangle that is 3D, Length x Width x Height
A plane
I will assume flatland describes the ficticious two dimensional (2D) world. In our world spacial dimensions are three dimensional (3D), meaning length, width, and depth (or height). In 3D, we see a square as a flat object with length and width. In 3D we see boxes or retangulars as having length, width, and depth. Flatlanders cannot visualize 3D just like we cannot visualize 4D. In flatland everything is 2D, so a square may be called a retangular (or box, or cube, etc...)
2D is flat, determined by a length and a width. 3D is determined by having a length, width, and height. 4D is determined by having a length, a width, a height, and a dimension in time.
2d is a flat shape with only 2 dimentions (width & length) 3d is a shape with 3 dimensions (width, length and depth)
Length x width = square footage
A plane shape, also known as a 2-dimensional shape.