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Q: What is a 3d figure with all faces exept one are triangles?

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A pyramid.

triangular pyramid

There is a contradiction in your question. If the base has four equal sides then is it a square so not all the faces are Triangles. However if the base is a square and the rest of the faces are triangles then your object is a "Square-based Pyramid"

A four faced figure is a tetrahedron. If they are all congruent triangles, they are all equilateral triangles and it is a regular tetrahedron - one of the 5 Platonic Solids.

tetrahedron

An octahedron.

octahedron

A regular octahedron.

Octohedron, or rhomboid.

You're an octagon.

No, the bases are triangles, the sides are rectangles.

A true triangle is a two dimensional object, so it has NO faces at all (or maybe one). Triangles have 3 sides, but not 3 faces.

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