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If all of the diagonals are drawn from a vertex of an octagon, how many triangles are formed

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Q: If all of the diagonals are drawn from a vertex of an n-gon how many triangles are formed?
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If all of the diagonals are drawn from a vertex of an octagon how many triangles are formed?

5 triangles are formed.


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Prove that if the diagonal of a parallelogram does not bisect the angles through the vertices to which the diagonal is drawn the parallelogram is not a rhombus?

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