Astrit will tie the goat with a 5 m long rope. One side of the rope is tied to the goat, and the other to a meadow ring that slides over an 18 m long iron rod. Calculate the surface of the lawn that the goat can reach if Astrit places the rod along the TU and UV ribs, as shown in the figure. Where should Astrit place rod b in order for the goat to reach the largest surface of the grass? Explain your answer.
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