Question 7
Angela built a pyramid using identical cubes. The pyramid is shown below from different angles. Angela paints the whole pyramid orange. How many cubes have exactly 3 faces painted orange?
Source convention: the centred solid has complete layers of 5 × 5, 3 × 3 and 1 identical cubes, with no hidden gaps. Paint every exposed exterior face, including the underside, without separating the cubes. Faces where cubes touch are not painted.
Source convention: the centred solid has complete layers of 5 × 5, 3 × 3 and 1 identical cubes, with no hidden gaps. Paint every exposed exterior face, including the underside, without separating the cubes. Faces where cubes touch are not painted.