document.write( "Question 1137545: find the measure of two supplementary angles such that one angle is four fifths as large as the other \n" ); document.write( "
Algebra.Com's Answer #755423 by MathLover1(20850)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "supplementary angles are two angles whose sum is \"180\"°\r
\n" ); document.write( "\n" ); document.write( "let one angle be \"alpha\" and its supplement \"beta\"\r
\n" ); document.write( "\n" ); document.write( " \"alpha%2Bbeta=180\"°\r
\n" ); document.write( "\n" ); document.write( "if one angle is four fifths as large as the other, we have \"beta=%284%2F5%29alpha\"\r
\n" ); document.write( "\n" ); document.write( "substitute it in \"alpha%2Bbeta=180\"°\r
\n" ); document.write( "\n" ); document.write( " \"alpha%2B%284%2F5%29alpha=180\"°......both sides multiply by \"5\"\r
\n" ); document.write( "\n" ); document.write( " \"5alpha%2B4alpha=180%2A5\"°\r
\n" ); document.write( "\n" ); document.write( "\"9alpha=900\"°\r
\n" ); document.write( "\n" ); document.write( "\"alpha=100\"°\r
\n" ); document.write( "\n" ); document.write( "then \"beta=%284%2F5%29100\"°=>\"beta=80\"°\r
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