document.write( "Question 1128628: A polygon has three of its interior angles to be 120 each and others are 150 each. calculate the number of sides of the polygon \n" ); document.write( "

Algebra.Com's Answer #745105 by ikleyn(52810) $\"\"$ $\"About$

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document.write( "120*3 + (n-3)*150 = (n-2)*180.\r\n" );
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document.write( "Simplify and solve for n.\r\n" );
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document.write( "120*3 + 150n - 3*150 = 180n - 2*180\r\n" );
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document.write( "120*3 - 3*150 + 2*180 = 180n - 150n\r\n" );
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document.write( "270 = 30 n   ====>   n =  = 9.     ANSWER\r\n" );
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