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As shown in the figure, a hexagon has 9 diagonals. How many diagonals are there in the nonagon below?

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The ACT Mathematics Test contains 60 questions to be answered in 60 minutes.  The hardest ACT math questions (the last 10 to 15 questions) fall into two types: advanced concepts and complex questions. Advanced concepts questions cover what you learn in precalculus and trigonometry. FYI: Students that get into Harvard College have an ACT score of 34–36.

As shown in the figure, a hexagon has 9 diagonals.<br><img alt='image' src='https://www.fatskills.com/images2/ACT/9781119275435-fg0252.png' /> How many diagonals are there in the nonagon below?<br><img alt='image' src='https://www.fatskills.com/images2/ACT/9781119275435-fg0253.png' />






 
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