document.write( "Question 835723: Write an indirect proof that two obtuse angles cannot for a linear pair. \n" ); document.write( "
Algebra.Com's Answer #503686 by Edwin McCravy(20056)![]() ![]() You can put this solution on YOUR website! \r\n" ); document.write( "Let the two obtuse angles are ∠A and ∠B,\r\n" ); document.write( "\r\n" ); document.write( "Assume they form a linear pair.\r\n" ); document.write( "\r\n" ); document.write( "1. m∠A + m∠B = 180° by definition of a linear pair.\r\n" ); document.write( "2. m∠A > 90° by definition of \"obtuse angle\"\r\n" ); document.write( "3. m∠B > 90° by definition of \"obtuse angle\"\r\n" ); document.write( " ----------\r\n" ); document.write( "4. m∠A + m∠B > 180° adding unequals to unequals in the same order gives\r\n" ); document.write( " unequals in the same order.\r\n" ); document.write( "\r\n" ); document.write( "Statement 4 contradicts statement 1.\r\n" ); document.write( "\r\n" ); document.write( "Therefore obtuse angles ∠A and ∠B cannot form a linear pair.\r\n" ); document.write( "\r\n" ); document.write( "Edwin\n" ); document.write( " |