Divide each of the sides of the triangle into three. Join corresponding points on each pair of sides.
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27 triangles. There are 16 one-cell triangles, 7 four-cell triangles, 3 nine-cell triangles, and 1 sixteen-cell triangle.
take three match for each triangle
The flag of Qatar consists of a serrated line with nine points, so technically there are no triangles. If one considers each point to be a triangle extension of the solid color, then there are 19 triangles (9 white, 10 red).
A nine sided shape has 7 triangles
Nine, as a n-gon can be cut in n-2 triangles.