a 3D shape has 3 dimensions; length, with and depth
A 3D shape must have length x width x depth.
Adding depth makes a 3D object from a 2D shape.
A cut diamond is a 3D object as it has length, width and depth (even if it is roundish like a pebble)
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.
a 3D shape has 3 dimensions; length, with and depth
A 3D shape must have length x width x depth.
Adding depth makes a 3D object from a 2D shape.
2d is a flat shape with only 2 dimentions (width & length) 3d is a shape with 3 dimensions (width, length and depth)
Adding depth makes a 3D object from a 2D shape.
A cut diamond is a 3D object as it has length, width and depth (even if it is roundish like a pebble)
You can have a 3d shape with any no of sides 3d only means there are three measure needed to calculate volume, or in other words you can pick it up and touch it. These three measurements are width, depth and height. If the faces all had to be of the same area and flat there might not be a 7 sided 3d shape (or a regular one at least) there can always be a n-sided non-irregular shape even a 1,253,703-sided irregular shape is theoretically possible.
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.
The difference between 2d and 3d shapes is that, a 2d shape is flat, has no volume and depth and cannot be handled while a 3d shape can be held, has depth, volume and can hold things inside it. These are the dimensional shapes which are mostly used in geometry.
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.
3D stands for three dimensional. If a shape has length, width, and depth, then it has three dimensions, thus it is 3D.
It depends on the 3d shape.