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.

Stack the pennies on top of each other. All four pennies are horizontally equaldistant from each other.

Posted by Joel on 2006-05-07 01:34:53