Free ACT Practice Question

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ID: ACT-M-159
Section: Math
Topics: Geometry; Geometry
Difficulty level: Easy

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The number of diagonals in a polygon having $n$ sides is given by the formula $\dfrac{n(n-3)}{2}$. What is the value of $n$ if it is known that the number of diagonals is double the number of sides of the polygon?

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