TITLE: Can you make an equilateral triangle from 3identical trapezoids?
QUESTION [5 upvotes]: Is it possible to make an equilateral triangle from 3 identical trapezoids? If so, what angles would be needed in the trapezoids?

REPLY [12 votes]: These are all $60^\circ$ equilateral triangles, 3 to the trapezoid. So these are isosceles trapazoids having two $60^\circ$ angles and two $120^\circ$ angles.