Any quadrilateral such as a 4 sided trapezium can be divided into 2 triangles
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27 triangles.27 triangles.27 triangles.27 triangles.
27, but you will have to prove it.
3*9 = 27 sides
27 triangles. There are 16 one-cell triangles, 7 four-cell triangles, 3 nine-cell triangles, and 1 sixteen-cell triangle.
27, if they are all separate. Far fewer otherwise.