Vertices - A vertex is a corner where edges meet (the plural is vertices). For example a cube has 8 vertices. The pyramids in Egypt look like square-based pyramids. They are called square-based ...

The area of the three faces is \(12 + 6 + 8 = 26~cm^2\). The total surface area is therefore \(26 \times 2 = 52~cm^2\).