Two.
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2 triangles and 3 rectangles(:
The minimum numbers of congruent faces are as follows: On an equilateral triangular prism: one pair of triangles On a right equilateral triangular prism: one pair of triangles and one triplet of rectangles.
Triangular prism: 2 triangles, 3 rectangles Triangular pyramid: 4 triangles.
There are a total of three parallelograms in a triangular prism. Each of the sides are parallelograms, while the ends are triangles.
A square based pyramid has 4 triangular faces and 1 square face.