Cone: A solid shape having a circular base and a single vertex.Sphere: A round 3D shape whose points on the surface are equidistant from the center.Different types of 3D models of prisms are given below. Prism: A solid shape with identical polygons at their ends and flat parallelograms on their sides.Cuboid: A 3D shape with six rectangular faces.Cube: A 3D shape with six square faces.Pyramid: It is a solid shape with a polygonal (closed shape having n number of sides) base with triangular faces.In other words, the shapes around you, the ones you can pick, touch, and rotate, have three dimensions. Similarly, the faces of 3D shapes are made up of 2D shapes hence, they have three dimensions. Since these shapes are made from a combination of 1D lines, they have two dimensions. Shapes like triangles, rectangles, squares, pentagons, circles, and so on are made up of lines. Lines have length hence, they are one-dimensional. We know that a point doesn’t have any length, width, or depth. To understand what 3D shapes are, we need to understand shapes with lower dimensions. In some cases, we use height instead of depth. Just like the name suggests, 3D shapes, or three-dimensional shapes, are solid shapes that have three dimensions: length, width, and depth. Hence, it makes sense to learn about the three-dimensionality of the world around us at a young age. In fact, we live in a three-dimensional world. But the fact that we can turn it around itself means that it is three-dimensional. Would you classify a sheet of paper as a 2D or a 3D object? It’s a common misconception that a sheet of paper is a two-dimensional object. What shapes do you commonly see in your surroundings? You can see lines and two-dimensional shapes, right? If you look carefully, you will notice that these lines and two-dimensional shapes are parts of some three-dimensional object. But don’t you think this should be learned in schools at an earlier grade? Before you read on, take a look at the objects around you. Most schools in the United States don’t teach 3D shapes until grade six. Just put on the 3D glasses, and voila! The scenes in 3D movies suddenly appear to be real because they have depth-an extra dimension! That’s the key difference between 2D and 3D shapes. What’s the difference between a 2D movie and a 3D movie? 3D movies are much more immersive.
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