If the sum of the interior angles of a regular polygon measures up to 1260 degrees, then how many sides does the polygon have?	Select the correct option:
A) 10
B) 9
C) 12
D) 11
E) 14
one of the interior angle = 180 - 360/n   sum of the interior angles is = n (180 - 360/n)   given   n(180 - 360/n)=1260   180n - 360 = 1260   180n = 1620   n = 1620/180= 
<gadget id="calculator">1620/180</gadget>
<output>9</output>
9   ANSWER:9
<result>B</result>
If the sum of the interior angles of a regular polygon measures up to 1260 degrees, then how many sides does the polygon have?