Two equilateral triangles



Problem

In the right figure,triangle ABC and ADE are equilateral triangles.
Find the triangle which is congruent with the triangle ACE .


Applet

How to use this applet

1.Drag red point to change the size of ADE .
2.Press "Define" button to go to next step .
3.Drag red point to rotate triangle ACE .
4.Press "Init" button to go to initial step .