document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1132905>Question 1132905</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the area of an equilateral triangle (regular 3-gon) with the given measurement. \r<BR>\n" );
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document.write( "9-inch perimeter\r<BR>\n" );
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document.write( "A = sq. in.\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #750057 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=750057\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> All three sides of an equilateral triangle are equal, then<BR>\n" );
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document.write( "9/3 = 3 inches for each side<BR>\n" );
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document.write( "use Pythagorean Theorem to finc the height(h)<BR>\n" );
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document.write( "h^2 + (3/2)^2 = 3^2<BR>\n" );
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document.write( "Note the height bisects the base<BR>\n" );
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document.write( "h^2 = 9 -9/4 = 27/4<BR>\n" );
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document.write( "h = 3 * square root(3) / 2<BR>\n" );
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document.write( "Area = (1/2) * 3 * (3 * square root(3) / 2) = 9 * square root(3) / 4<BR>\n" );
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document.write( "Area of triangle is 3.8971 square inches<BR>\n" );
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