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draw horizontal line segment AB to represent line L.
\n" ); document.write( "draw horizontal line segment CD underneath AB and parallel to AB representing line M parallel to line L.
\n" ); document.write( "draw vertical line segment EF perpendicular to AB and approximately in the middle of it representing line N perpendicular to line L. let EF pass through CD as well representing line N intersecting with line M as well as line L.
\n" ); document.write( "call the intersection of AB and EF point G.
\n" ); document.write( "call the intersection of CD and EF point H.
\n" ); document.write( "you should have:
\n" ); document.write( "horizontal line AB.
\n" ); document.write( "horizontal line CD parallel to it.
\n" ); document.write( "vertical line EF passing through AB at point G, and passing through CD at point H.
\n" ); document.write( "--------------------------------------------------
\n" ); document.write( "AB perpendicular to EF (given)
\n" ); document.write( "angle BGF = 90 degrees (if lines are perpendicular to each other then their angle of intersection equals 90 degrees).
\n" ); document.write( "angle CHE = angle BGF (alternate interior angles of parallel lines are equal).
\n" ); document.write( "angle CHE = 90 degrees (equal to angle BGF which is 90 degrees)
\n" ); document.write( "CD perpendicular to EF (if the angle of intersection equals 90 degrees then the lines forming the angle of intersection are perpendicular to each other).
\n" ); document.write( " \n" ); document.write( "