Even though we don't show the average fixed cost curve on the graph to the right, we still have all the information we need to show fixed costs. Remember that the difference between ATC and AVC is fixed cost, at any level of output.
The shaded area to the right is equal to fixed costs which is equal to Q* x (ATC - AVC). It wouldn't matter what Q we used, we would find the same value since fixed costs don't depend on output.
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