document.write( "Question 149073: the second angle of a triangle is 10 degrees less than three times the first angle. The third angle is 10 degrees less than the second angle. find the angles of this triangle \n" ); document.write( "
Algebra.Com's Answer #109356 by nabla(475)\"\" \"About 
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let angle 1 = a
\n" ); document.write( "angle 2= b
\n" ); document.write( "angle 3=c\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "a=a
\n" ); document.write( "b=3a-10
\n" ); document.write( "c=b-10\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "THEN\r
\n" ); document.write( "\n" ); document.write( "a=a
\n" ); document.write( "b=3a-10
\n" ); document.write( "c=3a-10-10\r
\n" ); document.write( "\n" ); document.write( "THEN\r
\n" ); document.write( "\n" ); document.write( "a=a
\n" ); document.write( "b=3a-10
\n" ); document.write( "c=3a-20\r
\n" ); document.write( "\n" ); document.write( "AND
\n" ); document.write( "a+b+c=180 (BECAUSE of the definition of a triangle having 180 degrees total angle measure)
\n" ); document.write( "SO
\n" ); document.write( "a+3a-10+3a-20=180
\n" ); document.write( "7a-30=180
\n" ); document.write( "7a=210
\n" ); document.write( "a=30.\r
\n" ); document.write( "\n" ); document.write( "So b=80 and c=70.\r
\n" ); document.write( "\n" ); document.write( "Angles are 30, 70, and 80.
\n" ); document.write( " \n" ); document.write( "
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