document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1011896>Question 1011896</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A,B,C are three points in a straight horizontal line.<BR>\n" );
document.write( "A plane is flying horizontally directly above ABC.<BR>\n" );
document.write( "When the plane passes over point B, the angle of elevation from A is 42 degrees.<BR>\n" );
document.write( "When the plane passes over point C, The angle of elevation from A is 34 degrees.<BR>\n" );
document.write( "The horizontal distance between B and C is 2km.\r<BR>\n" );
document.write( "\n" );
document.write( "Find the height of the plane above ABC to the nearest kilometre. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #627729 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=627729\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> ==*====*=====* <BR>\n" );
document.write( "==A====B====C<BR>\n" );
document.write( "tan 42=h/x<BR>\n" );
document.write( "tan 34=h/(x+2)<BR>\n" );
document.write( "0.900=h/x<BR>\n" );
document.write( "h=0.900x<BR>\n" );
document.write( "(x+2)*0.675=h<BR>\n" );
document.write( "set the two equal<BR>\n" );
document.write( "0.900x=0.675x+1.350<BR>\n" );
document.write( "0.225x=1.350<BR>\n" );
document.write( "x=6 km<BR>\n" );
document.write( "Therefore h=0.900x=5.4 km\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );