document.write( "Question 342811: In a triangle, the measure of the first angle is 20 more than the measure of the second angle. The third angle is twice the measure of the second angle. Find the measure of the third angle. \n" ); document.write( "

Algebra.Com's Answer #245416 by Fombitz(32388) $\"\"$ $\"About$

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In a triangle,
\n" ); document.write( " $\"A%2BB%2BC=180\"$
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\n" ); document.write( " $\"A=20%2BB\"$
\n" ); document.write( " $\"C=2B\"$
\n" ); document.write( "Substituting,
\n" ); document.write( " $\"%2820%2BB%29%2BB%2B%282B%29=180\"$
\n" ); document.write( " $\"4B%2B20=180\"$
\n" ); document.write( " $\"4B=160\"$
\n" ); document.write( " $\"B=40\"$ degrees
\n" ); document.write( "Then
\n" ); document.write( " $\"C=2%2840%29\"$
\n" ); document.write( " $\"highlight%28C=80%29\"$ degrees
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