Definition: In geometry, a merohedron is a type of geometric solid that can be considered as a three-dimensional analogue to a pyramid. It is named after the Greek word "mero" which means "three," and it is characterized by having six rectangular faces, each with three edges (perimeter). The vertices of the triangle formed by these edges are called the vertices of the tetrahedron, which can be thought of as a single point. In this sense, merohedra
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