Triangle Man Puzzle - Solution
The Puzzle:

The coins form three identical equilateral triangles as shown with the dotted lines.
Rearrange the coins into another shape with three equilateral triangles, each with a different size.
You may only change the position of one coin at a time, and in its new position it must touch at least two other coins.
How many moves are needed?
Author: Peter Grabarchuk
This Puzzle © 2007 Peter Grabarchuk. All Rights Reserved.
More from Peter Grabarchuk at PeterPuzzle.com
Our Solution:
5 moves, as shown here:

Author: Peter Grabarchuk
This Puzzle © 2007 Peter Grabarchuk. All Rights Reserved.

Author: Peter Grabarchuk
This Puzzle © 2007 Peter Grabarchuk. All Rights Reserved.
Puzzle Author: Grabarchuk, Peter