There's 12 of them
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No, there are 8.
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The mathematical name for corner is 'vertex' A cuboid has 8 vertices or corners. An example of a cuboid is a cereal box or a dice.
Both have 8 vertices.
By Euler's formula the number of faces (F), vertices (V), and edges (E) of any convex polyhedron are related by the formula F + V = E + 2. In the case of a cuboid this gives 6 + 8 = 12 + 2; that is, like a cube, a cuboid has 6 faces, 8 vertices, and 12 edges.
The same as a cube or cuboid. 6 faces, 8 vertices and 12 edges.
Assuming a block is a cuboid (or a brick), it has 6 faces, 12 edges and 8 vertices.