Draw an equilateral triangle. Divide it into four identical shapes. Remove the bottom left-hand shape. Now divide the resulting shape into four identical shapes.

(In reply to I can do this! (spoiler) by Steve Herman)

p.s. -- I just searched unsuccessfully for a name for an isosceles trapezoid with three equal sides.  Anybody?  

You know, as common as the shape is, I've never seen it given a name.  You can call it the triamond:  http://mathworld.wolfram.com/Triamond.html

Posted by Jer on 2013-04-29 12:55:44