Tetrahedron

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Across
  1. 2. how many tetrahedrons are in one prism with the base equal to tetrahedron base?
  2. 5. faces are ________ triangles
  3. 6. number of vertex corners
Down
  1. 1. triangular pyramid
  2. 3. It is one of the five regular _____ solids
  3. 4. number of straight edges