sum of all interior angles of a 11-sided polygon is ______(a)1620 (b)1440 (c)1260 (d)none of these
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Answer: A triangle is the smallest polygon.
The sum of interior angles of a triangle is 180°
Quadrilateral sum=360°
A formula emerges.
The sum of the interior angles of a polygon with 'n' sides is (n-2)180°
(Check this for yourself in the case of a triangle and quadrilateral)
Hence,
(n−2)∗180=1440
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