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Simple distances (Posted on 2006-05-01) Difficulty: 3 of 5
For this you will need four pennies. Arrange the pennies so that the centers of all four are equidistant from each other.

Example:

(1) (2) (3) (4)

This will not work because penny 1 and penny 4 are farther apart than penny 1 and penny 2.

See The Solution Submitted by Stephen    
Rating: 1.8571 (7 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution Pennies of Giza | Comment 2 of 8 |
The problem doesn't state that the four pennies need to remain on the same surface or in the same plane, so I think I'll form an equilateral triangle with three them on the table and hold the fourth up above to form an equilateral pyramid.
  Posted by Jyqm on 2006-05-01 09:23:48
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