document.write( "Question 629266: The first angle of a triangle is 17° and the second angle is 34° what is the third angle \n" ); document.write( "
Algebra.Com's Answer #396138 by Tatiana_Stebko(1539)\"\" \"About 
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The angles of a triangle always sum to 180°
\n" ); document.write( "Therefore the third angle of a triangle is 180°-(17°+34°)=129°
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