Originally Posted by HomeInMyShoes
Okay, I got no drawing options here, but if you take the top left matchstick you can rotate it about ninety degrees and slide it down and right to touch the other triangle about halfway up. Do a similar move with the top right matchstick and you will have a big equilateral triangle (the one on the bottom to start) and two quarter-size equilateral triangles. Plus a couple of great pointy ears.
Yes, that's the way to do it. You don't actually even need to rotate. Just move the right one to the left and the left one to the right. Over to you!