GEOMETRY
'(<a href="http://www.j-archive.com/media/2008-01-04_DJ_27.jpg" target="_blank">Jon of the Clue Crew shows a diagram on the monitor.</a>) You can see why the term for <a href="http://www.j-archive.com/media/2008-01-04_DJ_27a.jpg" target="_blank">this</a> type of triangle comes from the Greek for "with equal legs"'
an isosceles triangle