Question: I need help answering this (attached) Given a regular polygon having n sides, we can determine the number of diagonals D by the formula D

I need help answering this (attached)

Given a regular polygon having n sides, we can determine the number of diagonals D by the formula D = "2 3 3\" . A polygon has 20 diagonals. How many sides does 170 sides 152 sides the polygon have

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