None. A square triangle is an oxymoron - it cannot exist!
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Four(4). It is formally named as a 'tetrahedron'. There is the triangular base ; one side. and three triangular faces m aking for a total of four faces. A square based 'pyramid' is formally a 'pyramid'. A square base and four triangular faces.
A triangular based pyramid has 4 sides. 3 triangle sides and 1 Square base
None, because there can be no such thing as a triangular square. If it is triangular it cannot be a square, if it is a square it cannot be triangular.
2 of them.
4 triangular lateral faces