document.write( "Question 877561: In ∆ABC, m∠A = 3x + 1, m∠B = 4x - 17,and m∠C = 5x - 20. Which type of triangle is ∆ABC? \n" ); document.write( "

Algebra.Com's Answer #530085 by Fombitz(32388) $\"\"$ $\"About$

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$\"A%2BB%2BC=180\"$
\n" ); document.write( " $\"3x%2B1%2B4x-17%2B5x-20=180\"$
\n" ); document.write( " $\"12x=216\"$
\n" ); document.write( " $\"x=18\"$
\n" ); document.write( " $\"A=3x%2B1=54%2B1=55\"$
\n" ); document.write( " $\"B=4x-17=72-17=55\"$
\n" ); document.write( " $\"C=5x-20=70\"$
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\n" ); document.write( ".\r
\n" ); document.write( "\n" ); document.write( "ABC is an isosceles triangle.
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