The faces of a regular triangular pyramid are:

Congruent

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Similar

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Congruent but not similar

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None of these

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Solution

The correct options are
A
Congruent

B
Similar

In a regular triangular pyramid, all of its faces are triangles (The base is an equilateral triangle and the lateral faces are triangles in any pyramid)
All the edges are equal in length.
Hence, the triangles formed by all the faces are congruent triangles.

(Note that all congruent triangles are similar.)

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