That shape is a unit equilateral triangular dipyramid, and it has 6 faces.
Two triangles can be formed by the diagonals of one vertex of a four-sided polygon.
18
5 triangles.
Tetrahedron 3 triangles meet at each vertex 4 Faces 4 Vertices 6 Edges Cube 3 squares meet at each vertex 6 Faces 8 Vertices 12 Edges Octahedron 4 triangles meet at each vertex 8 Faces 6 Vertices 12 Edges Dodecahedron 3 pentagons meet at each vertex 12 Faces 20 Vertices 30 Edges Icosahedron 5 triangles meet at each vertex 20 Faces 12 Vertices 30 Edges
As many as she wants.
Any n-sided regular polygon, by joining a single vertex up to each of the others, will have a total of (n - 2) triangles inside. In this case, an 11-sided polygon will contain 11 - 2 = 9 triangles.
If all of the diagonals are drawn from a vertex of an octagon, how many triangles are formed
18 triangles
It can form 7 triangles
depends on what shape that vertex is in
Three triangles
That shape is a unit equilateral triangular dipyramid, and it has 6 faces.
5 triangles are formed.
You Can Get 6 triangles
3 triangles
A hexagon (six-sided polygon) can be divided into 4 triangles by drawing all of the diagonals from one vertex (only three lines can be drawn in this case, since each vertex already connects to two others on the edges of the form). If you instead drew lines from the center to each vertex, you would get 6 triangles.