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Close packing in an FCC lattice

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Potassium bromide, KBr, crystallizes like NaCl in a face centered cubic lattice. The ionic radius of K+ is 133 pm and the ionic radius of Br- is 195 pm. Assuming that all Br- ions are positioned in the face and corners of the unit cell, while the K+ ions are positioned along the edge alternating between anions, calculate the length of a unit cell edge. Show work and thanks for your help and time.

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The solution includes cartoons that demonstrate the close packing of FCC lattice and explains how to find the unit cell dimensions.

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