document.write( "Question 938170: Quadrilateral ABCD is inscribed in a circle. m A is 64°, m B is (6x + 4)°, and m C is (9x - 1)°. What is m D? \n" ); document.write( "
Algebra.Com's Answer #572332 by Edwin McCravy(20060)\"\" \"About 
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document.write( "A quadrilateral ABCD is cyclic if and only if its opposite \r\n" );
document.write( "angles are supplementary.\r\n" );
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document.write( "A and C are opposite angles, so they are supplementary\r\n" );
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document.write( "m∠A + m∠C = 180°\r\n" );
document.write( "9x-1 + 64 = 180\r\n" );
document.write( "    9x+63 = 180\r\n" );
document.write( "       9x = 117\r\n" );
document.write( "        x = 13°\r\n" );
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document.write( "m∠B = 6x+4 = 6(13)+4 = 82°\r\n" );
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document.write( "B and D are opposite angles, so they are supplementary\r\n" );
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document.write( "m∠B + m∠D = 180°\r\n" );
document.write( "82° + m∠D = 180°\r\n" );
document.write( "      m∠D = 98°\r\n" );
document.write( "      \r\n" );
document.write( "Edwin
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