document.write( "Question 151064: given:angle4 is an exterior angle of the triangle
\n" ); document.write( " Proves:m angle 4= angle 1+ angle 2\r
\n" ); document.write( "\n" ); document.write( "m angle 3+ m angle 4=180??\r
\n" ); document.write( "\n" ); document.write( "those that is Definition Supplementary angles???
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Algebra.Com's Answer #110985 by vleith(2983)\"\" \"About 
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Almost there.
\n" ); document.write( "Yes 3 and 4 are supplementary. So they total 180
\n" ); document.write( "The sum of the three angles in a triangle is always 180 too. \r
\n" ); document.write( "\n" ); document.write( "So 1 + 2 + 3 = 180
\n" ); document.write( "3 +4 = 180
\n" ); document.write( "1+2+3 = 3+4
\n" ); document.write( "1+2 = 4
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