Let ABCD be the bottom face & EFGH be the top face of the
cube.(edges of the other faces are AE,BF,CG,DH). Let P be the
mid point of BF & Q be the mid point of DH. Now APGQ forms a
square. side of this new square=AP= sqrt(AB*AB+BP*BP)=
sqrt(1*1+0.5*0.5)=sqrt(1.25).

Posted by suman
on 20050129 19:52:33 