So far this school year, we have mostly focused on 2-Dimensional (2-D) shapes. Examples of 2-D shapes would be rectangles, squares, triangles, parallelograms, trapezoids, pentagons, hexagons, octagons etc. A 2-D shape is flat and has no depth at all. Only area and perimeter can be found on these shapes.
3-Dimensional (3-D) shapes are different from 2-D shapes. While 2-D shapes only have two dimensions such as length and width (or base and height), 3-D shapes have three dimensions. The third dimension is called DEPTH. 3-D shapes not only have length and width, but they also have depth. This is why 3-D movies kinda pop out at you, rather than a regular 2-D movie that does not pop out at ya!
3-D shapes are often referred to as prisms or pyramids. Both a prism and a pyramid is more specifically classified by the shape of their base (or bottom). Pyramids can be triangular pyramids, square pyramids, rectangular pyramids, pentagonal pyramids, and so on. Prisms can be classified as triangular prisms, square prisms (or cubes), rectangular prisms, etc. The main difference between a pyramid and prism is that a pyramid has a pointy top and a prism is flat on BOTH the top and the bottom.
When a 3-D shape is unfolded and all of it's faces are laid out flat, we call that a NET. (Nets are often used to find surface area - but that's for another post!) 3-D shapes also have faces, edges, and vertices. Check out the images and videos below to further develop your understanding of these shapes and their components.
Hello there! I am delighted that you decided to stop by our math page! Please feel free to email me at any time if you have questions or concerns throughout the year. I hope that you will enjoy looking through the photographs of me, my husband, and our three 4-legged "children"! Their names are Howie (brown), Henry (black), and Hank (black and white and goofy). Lets have a great year and go Rebels!!! :)