



 
Hi Jasmin. This just takes a little bit of geometry. Here's a hint: Draw the shape connecting all five centers of the spheres: You get a squarebased pyramid in which all edges have the same length: two radii, so 4 cm. If you can determine the height of the pyramid, you can easily see the height the box needs to be. Work out the pyramid's height by using Pythagoras' Theorem twice. Hope this helps,  


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