no triangles
You can put 2 triangles in a square or you can call it a quadrilateral.
It depends on the size of the square and the sizes and shapes of the triangles.
27, but you will have to prove it.
A square based pyramid has 4 triangular faces.
a square pyramid has 4 triangles
no triangles
One square and four triangles.
You can put 2 triangles in a square or you can call it a quadrilateral.
It depends on the size of the square and the sizes and shapes of the triangles.
4 right triangles
2 are in a square
A square based pyramid has 4 triangular faces and 1 square face.
two
For a square with side S. There will be the 4 small triangles each with sides {S/sqrt(2),S/sqrt(2),S}. Then also you can 'see' 4 larger triangles, each with sides {S,S,S*sqrt(2)}
27, but you will have to prove it.
the answer is pyramid