The number of diagonals of an -sided polygon is given by the formula

MATHEMATICS · Subjective · CBSE · Mathematics · Quadratic Equations · Quadratic Equations

Problem

The number of diagonals of an nn -sided polygon is given by the formula D=n2(n−3)D = \frac{n}{2}(n - 3) . A polygon has 90 diagonals. How many sides does it have?

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