Question : Find the sum of the measures of all the interior angles of a polygon having twelve sides.
Option 1: 1800°
Option 2: 2520°
Option 3: 2880°
Option 4: 3240°
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Correct Answer: 1800°
Solution : Given: Sides of the polygon, $n$ = 12 A polygon with $n$ sides has an interior angle sum = $(n -2)×180°$ = $(12 - 2)×180°$ = $10×180°$ = $1800°$ Hence, the correct answer is 1800°.
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