An edge is defined as the line segment on the boundary that joins one vertex to the other vertex. It means that it joins one corner point to the other. It forms the skeleton of 3D shapes. In other words, it can be defined as the faces, that meet in the straight line is called edge. Following are the list of edges for the different solid shapes:
| Solid Shapes | No. of. Edges |
| Triangular Prism | 9 |
| Cube | 12 |
| Rectangular prism | 12 |
| Pentagonal Prism | 15 |
| Hexagonal Prism | 18 |
| Triangular Pyramid | 6 |
| Square Pyramid | 8 |
| Pentagonal Pyramid | 10 |
| Hexagonal Pyramid | 12 |
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