document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1141232>Question 1141232</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a regular pentagon ABCDE is inscribe in a circle, centre O. calculate angle ABD. well explain with the diagram<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 #761755 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=761755\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "Angle B, an interior angle of a regular pentagon, is 108 degrees.<br><BR>\n" );
document.write( "Angles ABE and CBD, being base angles in isosceles triangles with vertex angles of 108 degrees, are each 36 degrees.<br><BR>\n" );
document.write( "That makes angle EBD 36 degrees.<br><BR>\n" );
document.write( "Then angle ABD is angle ABE plus angle EBD, which is 36+36 = 72 degrees. </SPAN>\n" );
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