document.write( "Question 1177469: Two column proof.\r
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Algebra.Com's Answer #806560 by math_helper(2461) $\"\"$ $\"About$

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document.write( "m∠1 + m∠2 + m∠3 = 180°         Sum of angles of a triangle is 180°\r
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document.write( "m∠4 + m∠3 = 180°               Supplementary angles add to 180°\r
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document.write( "m∠1 + m∠2 - m∠4 = 0           Subtracted bottom eqn from top eqn\r
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document.write( "m∠1 + m∠2 = m∠4               Added m∠4 to both sides, (DONE) 
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