![]() In this case, try and visualize if there are any ‘hidden’ faces, edges, or vertices behind or underneath the 3D representation. Some drawings use dashed lines to represent edges that cannot be seen but sometimes they do not. 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.
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