document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=556878>Question 556878</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Lines m and n intersect at point A.  Line k is perpendicular to both lines m and n at point A. Which statement must be true?\r<BR>\n" );
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document.write( "1) Lines m, n and k are in the same plane.<BR>\n" );
document.write( "2) Lines m and n are in two different planes.<BR>\n" );
document.write( "3) Lines m and n are perpendicular to each other.<BR>\n" );
document.write( "4) Line k is perpendicular to the plane containing lines m and n.\r<BR>\n" );
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document.write( "The correct answer choice is number 4, but I don't know why it is not 3. \r<BR>\n" );
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document.write( "Please help!!! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #362306 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=362306\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Lines m and n intersect at point A.  Line k is perpendicular to both lines m and n at point A. Which statement must be true?\r<BR>\n" );
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document.write( "1) Lines m, n and k are in the same plane.<BR>\n" );
document.write( "2) Lines m and n are in two different planes.<BR>\n" );
document.write( "3) Lines m and n are perpendicular to each other.<BR>\n" );
document.write( "4) Line k is perpendicular to the plane containing lines m and n.\r<BR>\n" );
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document.write( "The correct answer choice is number 4, but I don't know why it is not 3. <BR>\n" );
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document.write( "If you draw 2 intersecting lines on paper, a 3rd line can be perpendicular to both if the 1st 2 lines are perpenicular, or if they're not.<BR>\n" );
document.write( "3 might be true, but is not a requirement.\r<BR>\n" );
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document.write( "Use a paper on a desk and do it.  a pencil held perpendicular to both lines is perpendicular, actually the term is normal, to the paper.  This is true regardless of the angle between the lines on the paper.<BR>\n" );
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document.write( "PS  3-space is a lot more than 50% harder than 2-space.\r<BR>\n" );
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