There are 21 vertices in seven triangles.
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seven
seven There are five triangles in a heptagon. In ay convex polygon the triangles are two less than the sides. So a heptagon which has 7 sides, contains 5 triangles. There are five triangles in a heptagon. In ay convex polygon the triangles are two less than the sides. So a heptagon which has 7 sides, contains 5 triangles.
A heptagon has 5 triangles.
7 triangles
There are 7 triangles in a nonegon