Summer Clouds
21/06/2017 at 08:48-
In 1 tetrahedrons , we have 4 faces around it
With 1 cube , we have 6 faces
That so , if we have 13 tetrahedrons mean we have 4.13 = 52 faces
And with 5 cubes mean we have 5.6 = 30 faces
The total is : 52 + 30 = 82 faces
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How many cubes are there ?