Question 323668
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The formula for the number of diagonals in a polygon given the number of sides is:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \frac{n(n\,-\,3)}{2}]


so for 170 diagonals, solve the equation:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \frac{n(n\,-\,3)}{2}\ =\ 170]


to determine *[tex \LARGE n], the number of sides.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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