document.write( "Question 1174337: If the alternate angles created by 2 parallel lines and a transversal are supplementary, what are their measures? Explain. \n" ); document.write( "
Algebra.Com's Answer #799794 by Boreal(15235)\"\" \"About 
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They are 90% and the transversal is perpendicular to the parallel lines.
\n" ); document.write( "Alternate interior angles are equal but are also supplementary, so if each is x, x+x=180 and x=90 deg.
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