Question 247861
A cube ABCDEFGH has edges of length 4. 
If the faces of the cube are "missing", but the egdes are solid lines(forming a cubical frame), what is the radius of the largest sphere that just fits inside the cubical frame.(touching each of the twelve edges) 
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The diameter of the sphere is the diagonal across the square, = 4sqrt(2)
The radius = 2sqrt(2)
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It's the same as a circle containing a square of sides = 4.