This is how to find the number of Diagonals in a polygon:
Say you have a triangle, and you are wanting to know how many diagonals there are. The rule, on the left, demonstrates how to find the number of diagonals. There are no diagonals in a triangle. You must minus (3) from the number of sides, then multiply the sides by your answer. Divide it by 2 and you will get your answer.
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