document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=318522>Question 318522</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the area of an equilateral triangle that has a perimeter of 21 inches.  Round the answer to one decimal place. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #227975 by </B><A HREF=/tutors/aboutme.mpl?userid=Earlsdon><B>Earlsdon(6294)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Earlsdon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=227975\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You could use Heron/Hero's formula for finding the area of a triangle when you know the lengths of the three sides, a, b, and c.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+sqrt%28s%28s-a%29%28s-b%29%28s-c%29%29 ALIGN=MIDDLE  ALT=\"A+=+sqrt%28s%28s-a%29%28s-b%29%28s-c%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > s = the semi-perimeter of the triangle.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=+21%2F2 ALIGN=MIDDLE  ALT=\"s+=+21%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=s+=+10.5 ALIGN=MIDDLE  ALT=\"s+=+10.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a+=+b ALIGN=MIDDLE  ALT=\"a+=+b\"   DISABLED_style= \"max-width:90%; height:auto;\" >=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c+=+21%2F3 ALIGN=MIDDLE  ALT=\"c+=+21%2F3\"   DISABLED_style= \"max-width:90%; height:auto;\" > =<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=7 ALIGN=MIDDLE  ALT=\"7\"   DISABLED_style= \"max-width:90%; height:auto;\" > Make the appropriate substitutions:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+sqrt%2810.5%2810.5-7%29%2810.5-7%29%2810.5-7%29%29 ALIGN=MIDDLE  ALT=\"A+=+sqrt%2810.5%2810.5-7%29%2810.5-7%29%2810.5-7%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+sqrt%2810.5%283.5%29%5E3%29 ALIGN=MIDDLE  ALT=\"A+=+sqrt%2810.5%283.5%29%5E3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+sqrt%2810.5%2842.875%29%29 ALIGN=MIDDLE  ALT=\"A+=+sqrt%2810.5%2842.875%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+sqrt%28450.1875%29 ALIGN=MIDDLE  ALT=\"A+=+sqrt%28450.1875%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+21.2 ALIGN=MIDDLE  ALT=\"A+=+21.2\"   DISABLED_style= \"max-width:90%; height:auto;\" >sq.in. (Rounded to one decimal place.) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );