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12-3 = 9

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Q: How many diagonals can be drawn from one vertex of dodecagon?
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If all of the diagonals are drawn from a vertex of an n-gon how many triangles are formed?

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


How many diagonals can be drawn from any vertex of a 20-sided polygon?

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If in a 54 sided polygon all possible diagonals are drawn from one vertex they divide the interior of the polygon into how many regions?

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