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9. The sum of the measures of the interior angles of a triangle is 180°; the sum of the measures of the interior angles of a quadrilateral is 360°; the sum of the measures of the interior angles of a pentagon is 540°. Which is reasonable conjecture about the sum of the interior angle measures of a polygon with n sides?
A. SIA = n. 60° C. SIA = n. 90°
B. SIA = n. 180° D. SIA = (n-2). 180°
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