depends on what shape that vertex is in
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If all of the diagonals are drawn from a vertex of an octagon, how many triangles are formed
A heptagon has seven sides, so when drawing diagonals from one vertex, it will create five triangles. This is because each diagonal drawn from a single vertex will create a triangle until it intersects the previous diagonal. Therefore, the number of triangles formed by drawing all diagonals from one vertex in a heptagon is five.
1 triangle is formed.
4