alleryTwo regular tetrahedra join at a face, apices opposite. Outer (faces, vertices, edges)?
A6, 5, 9
B7, 5, 10
C8, 8, 12
D6, 6, 12
Answer & Solution
Correct answer: A. 6, 5, 9
Two shared faces are internal, giving six faces; the three shared vertices and edges are each counted once, giving five vertices and nine edges.
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