tetrahedron
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First, consider that at each vertex (point) at least three faces must come together, for if only two came together they would collapse against one another and we would not get a solid. Second, observe that the sum of the interior angles of the faces meeting at each vertex must be less than 360°, for otherwise they would not all fit together.
448389 is five less than 448394
a solid dot is , if less tha or equal to, or grearter than or just greater than and less than.
this means no less than five. It can be five or above
0.54, for example.