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A cube contains 9 identical spheres, as shown below......................What is the radius of each sphere?

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A cube contains 9 identical spheres, as shown below. There is one sphere in the center of the cube. Above (and below) the center sphere are 4 spheres tangent to the center sphere and the 4 corners of the cube.
What is the radius of each sphere?

enter image description here

posted Oct 28, 2020 by Ujjwal Mehra

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