document.write( "Question 1054682: What is the ratio of sum of interior angles of a triangle to its exterior angles \n" ); document.write( "
Algebra.Com's Answer #669868 by Fombitz(32388)\"\" \"About 
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Let the interior angles be A, B, and C and a,b, and c be the exterior angles.
\n" ); document.write( "\"A%2BB%2BC=180\"
\n" ); document.write( "\"A%2Ba=180\"
\n" ); document.write( "\"B%2Bb=180\"
\n" ); document.write( "\"C%2Bc=180\"
\n" ); document.write( "\"A=180-a\"
\n" ); document.write( "\"B=180-b\"
\n" ); document.write( "\"C=180-c\"
\n" ); document.write( "Substituting,
\n" ); document.write( "\"180-a%2B180-b%2B180-c=180\"
\n" ); document.write( "\"a%2Bb%2Bc=360\"
\n" ); document.write( "So then,
\n" ); document.write( "\"R=%28A%2BB%2BC%29%2F%28a%2Bb%2Bc%29=180%2F360=1%2F2\"
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