How many diagonals are there is a polygon having 12 sides ?

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Solution

The correct option is D 54
Formula for number of diagonals on an $n =$ sided polygon $= \frac{n (n - 3)}{2}$
For $n = 12$
Number of diagonals $= \frac{12 \times (12 - 3)}{2}$
$= \frac{12 \times 9}{2}$
$= 54$ .

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