Find the radius of the circle? Two Circle of an equal of an radii are drawn  , without any overlap , in a semicircle of radius 2 cm.
If these are the largest possible circles that the semicircle can accomodate , then 
what is the radius of each of the circles?
Thanks in advance.

By construction, the maximum radius of two circles of equal size in a circle of radius r is 1/2r.  The maximum radius of 4 circles of equal size in a circle of radius x is 1/4r.
