document.write( "Question 127973: one angle of a triangle is 20 degrees. the second angles measurement is four times the third. what is the measure of the third angle? \n" ); document.write( "

Algebra.Com's Answer #93731 by MathLover1(20850) $\"\"$ $\"About$

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one angle $\"highlight%28x=20%29\"$ degrees \r
\n" ); document.write( "\n" ); document.write( "the second $\"y=4z\"$ \r
\n" ); document.write( "\n" ); document.write( "the third $\"z\"$ \r
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\n" ); document.write( "\n" ); document.write( "the sum of all angles in a triangle is $\"180\"$ degrees, so we will have:\r
\n" ); document.write( "\n" ); document.write( " $\"x%2By%2Bz+=180\"$ .........substitute $\"x\"$ and $\"y\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"20%2B4z%2Bz+=180\"$ .........\r
\n" ); document.write( "\n" ); document.write( " $\"5z+=180-20\"$ .........\r
\n" ); document.write( "\n" ); document.write( " $\"5z+=160\"$ .........\r
\n" ); document.write( "\n" ); document.write( " $\"z+=160%2F5\"$ .........\r
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\n" ); document.write( "\n" ); document.write( " $\"highlight%28z+=+32%29\"$ .........the third angle\r
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\n" ); document.write( "\n" ); document.write( " $\"y=4z\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"y=4%2A32\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28y+=+128%29\"$ ....the second angle\r
\n" ); document.write( "\n" ); document.write( "check:\r
\n" ); document.write( "\n" ); document.write( " $\"20%2B128%2B32+=180\"$ .........\r
\n" ); document.write( "\n" ); document.write( " $\"148%2B32+=180\"$ .........\r
\n" ); document.write( "\n" ); document.write( " $\"180+=+180\"$ .........\r
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