Five circles are arranged in the following fashion ( Two rows of 3 circles in square arrangement with one end circle removed from the top row ). Circles are of same diameter and touching adjoining circles as per the diagram. Draw a line passing through A ( Centre of the first circle on the bottom row ) in such a way that it divides the five circles into two equal areas.
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(In reply to
Equation spoiler by Larry)
Your equation looks to be correct if the circles have radius 1 (which was not in the given information). With circles of radius 1, e.g.'s point B is (3,1).
Added in edit: As others have pointed out, it is not necessary
for the circles to have radius 1. Larry's equation is be correct for
any radius as long as A is at (0,0).
Edited on August 26, 2006, 5:36 pm

Posted by Richard
on 20060826 11:52:00 