document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=655709>Question 655709</A>: <I><SPAN STYLE=\"word-break: break-all;\"> sin(3 pie/4) without using a calculator<BR>\n" );
document.write( "sin of alpha= y/r<BR>\n" );
document.write( "so far:<BR>\n" );
document.write( "I drew a 45-45-90 triangle <BR>\n" );
document.write( "the book uses y=1<BR>\n" );
document.write( "x=1 and somehow r= square root of 2<BR>\n" );
document.write( "where do I go from here and how to I get the values of x,y, and r in these kinds of problems?<BR>\n" );
document.write( "thanks for your help.<BR>\n" );
document.write( "my name is Corinna. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #409249 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=409249\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> sin(3 pie/4) without using a calculator<BR>\n" );
document.write( "sin of alpha= y/r<BR>\n" );
document.write( "so far:<BR>\n" );
document.write( "I drew a 45-45-90 triangle <BR>\n" );
document.write( "the book uses y=1<BR>\n" );
document.write( "x=1 and somehow r= square root of 2<BR>\n" );
document.write( "where do I go from here and how to I get the values of x,y, and r in these kinds of problems?<BR>\n" );
document.write( "---------------------<BR>\n" );
document.write( "3pi/4 = 135 degs, if that's easier<BR>\n" );
document.write( "(PS, it's pi, the Greek letter, not pie, the dessert)<BR>\n" );
document.write( "----------<BR>\n" );
document.write( "I drew a 45-45-90 triangle <BR>\n" );
document.write( "the book uses y=1<BR>\n" );
document.write( "x=1 and somehow r= square root of 2<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "For a right triangle with x & y = 1, use Pythagoras to find r, the hypotenuse.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E2+=+x%5E2+%2B+y%5E2+=+2 ALIGN=MIDDLE  ALT=\"r%5E2+=+x%5E2+%2B+y%5E2+=+2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r+=+sqrt%282%29 ALIGN=MIDDLE  ALT=\"r+=+sqrt%282%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "---------<BR>\n" );
document.write( "Then at 135 degs, y is +1 and x is -1<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sin%283pi%2F4%29+=+y%2Fr+=+1%2Fsqrt%282%29 ALIGN=MIDDLE  ALT=\"sin%283pi%2F4%29+=+y%2Fr+=+1%2Fsqrt%282%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "= <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%282%29%2F2 ALIGN=MIDDLE  ALT=\"sqrt%282%29%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );