Coin Triangle

 

by Serhiy Grabarchuk

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Arrange nine identical coins into the right triangle shown in the illustration.

Change the triangle into a square by moving the minimum of the coins.

How many coins will you need to move to do this?

To play the interactive version of the puzzle, please, visit it
here.

 
Posted: December 14, 2007
Puzzle
Solution
PDF Version (49 KB)

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