Packing efficiency can be calculated as:

$\overline{){\mathbf{PE}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}\frac{\mathbf{area}\mathbf{}\mathbf{of}\mathbf{}\mathbf{atoms}}{\mathbf{area}\mathbf{}\mathbf{of}\mathbf{}\mathbf{unit}\mathbf{}\mathbf{cell}}{\mathbf{x}}{\mathbf{100}}}$

Notice that each atom is represented by a circle which has an area of πr^{2}

Calculate the packing efficiency of the two-dimensional lattice shown here:

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