document.write( "Question 182901: working with triangles: 10. If angle s =49 and angle t = 11, then angle r = ______. \n" ); document.write( "
Algebra.Com's Answer #137310 by Alan3354(69443)\"\" \"About 
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working with triangles: 10. If angle s =49 and angle t = 11, then angle r = ______.
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\n" ); document.write( "The sum of the angles of ALL (flat) triangles is 180 degs.
\n" ); document.write( "s+t = 60, so the 3rd one has to be 120 degrees.
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