![]() In this case, try and visualize if there are any ‘hidden’ faces, edges, or vertices behind or underneath the 3D representation. Students will first learn about 3D shape names as part of geometry in 1 1 st grade. Some drawings use dashed lines to represent edges that cannot be seen but sometimes they do not. Here you will learn about 3D shape names, including types of polyhedra (prisms, pyramids, platonic solids, irregular), non-polyhedra (cones, cylinders, spheres, hemispheres) and compound 3D shapes. When counting the faces, edges or vertices on an image of a 3D shape, you should consider if there are any that are ‘hidden’. Not counting “hidden” faces, edges and vertices. ![]() ![]() Surface area is measured in square units (for example, mm^, etc.).įor volume, you may also be asked to give your answer in liters or millimeters for example. You should always include units in your final answer. For example, if one length is given in meters and another is given in centimeters, you must convert one of them so that they are either both in meters or both in centimeters. This may mean that you need to convert a unit before you carry out a calculation. When you are calculating volume or surface area, you must ensure that the units of length you are using are the same. Using a mixture of units in a calculation.Make sure you select the right one by correctly identifying the 3D shape in the question and what it is asking you to calculate. There are several formulas for surface area and volume. The properties of 3D shapes can help to classify them and recall their names. A 3D shape is either a polyhedra or a non-polyhedra.ģD shapes can then be further categorized as shown in the table below. 3D shapes can be categorized in several ways.
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