Sequences and Series: Word Problem on A.P! Help

amoeez

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Dec 9, 2010
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Not figuring out how to solve it ...!
The sum of interior angles having sides 3,4,5,.....etc form an A.P(Arithmetic Progression). Find the sum of the interior angles for a 16 sided polygon.
 
The sum of the interior angles of a polygon is 180(n-2), where n is the number of sides.
 
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