Generally - a parallelogram.
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It can have 5 triangles
There are 11 triangles in an undecagon. The number of sides of a polygon is the number of triangles it has.
18 triangles
The number of triangles that can be formed within a regular polygon depends on the number of sides the polygon has. For an n-sided polygon, where n is greater than or equal to 3, you can form n-2 triangles within the polygon. This is because each triangle is formed by connecting one vertex to any other two non-adjacent vertices. So, for example, in a regular pentagon (5-sided polygon), you can form 5-2 = 3 triangles.
pyramid