Intuition tests 直觉测试 - 0

Zk从某处看来的问题。一个正四面体和一个棱长与之相等的正四棱锥，将正三角形的面贴合面，棱贴合棱，得到多少面体？

Question from Zk from somewhere ...If we put a face of a regular tetrahedron, to one of the triangle faces of a square pyramid with equilateral triangular sides and same edge length, face to face, edges to edges, then how many faces are there?

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