There is no single formula for the width of any arbitrary shape. If however, you already have two points that define that width, then you can calculate the distance between them with simple Pythagorean theorem:
w = [Δx2 + Δy2 + Δz2]1/2
A 3D shape must have length x width x depth.
A television set is a 3D shape. The image (picture) on the television screen is a 2D shape. 3D is when it has length, width, and height. 2D is only length and width.
A 3d shape is a shape with 3 dimensions. they are height width and length.
2d is a flat shape with only 2 dimentions (width & length) 3d is a shape with 3 dimensions (width, length and depth)
A 3d shape is a forms of shapes that have length , width and death of thickness.
A rhombus is a four sided polygon, a quadrilateral. It is a 2d shape. 2d shapes have 2 dimensions, like length and width. 3d shapes have 3 dimensions, like length, width and depth.
you times the width by the legnth of the shape
A sheet of A4 paper could be classed as a plane 2D shape, as it has length x width. A shoebox is an example of a 3D shape, as it has length x width x depth.
Only if the shape is a cuboid.
Length x Width x Height * * * * * That is only true if the shape is a cuboid. Not if it is a sphere, cylinder, cone, prism, pyramid - all of which have relatively simple formulae.
3d stands for '3-dimensional', meaning that the shape has three parametres (or directions) for its space, usually translated as it has length, width, and height.
In order to be 3D it must have a length, a width, and a height. EDIT: Mobius Strip