Lesson 1 of 11
Faces, edges and corners
Show on a big screenA die has flat faces, straight edges and sharp corners. Count them on any solid, a shape with depth.
Step 1 of 4
- A cube: 6 faces, 8 corners, 12 edges.
- One face — a flat piece.
- One edge — where two faces meet.
- One corner — where edges meet.
Rule: Count the flat faces. Count the edges, where two faces meet. Count the corners, also called vertices, where edges meet.
The table uses these shapes. A cuboid is a box with rectangle faces. A tetrahedron has 4 triangle faces. A prism has two matching flat ends. A pyramid comes to a point on top.
| Solid | Faces | Corners | Edges |
|---|---|---|---|
| Cube | 6 | 8 | 12 |
| Cuboid | 6 | 8 | 12 |
| Triangular prism | 5 | 6 | 9 |
| Square pyramid | 5 | 5 | 8 |
| Tetrahedron | 4 | 4 | 6 |
A cube and a cuboid have the same counts. A square pyramid and a triangular prism both have 5 faces. The pyramid has 8 edges. The prism has 9.
Tap Count one more. Watch each part light up.
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