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Ответ:

а) равные ребра

[tex]AB =BC=AC = A_{1} B_{1} = B_{1} C_{1} = A_{1} C_{1}[/tex]

и

[tex]AA_{1} = BB_{1}=CC_{1}[/tex]

б) равные грани

[tex]A_{1} B_{1}C_{1} = ABC[/tex]

и

[tex]A_{1} B_{1}BA = C_{1} B_{1}BC = A_{1} C_{1}CA[/tex]