There are different formulae for different shapes. And since you have not bothered to share any information about the shape, I cannot provide a more useful answer.
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The area of Torremocha de Jiloca is 33 square kilometers.
The area of Tezontepec de Aldama is 133.6 square kilometers.
The area of Tapia de Casariego is 65.99 square kilometers.
The area of Póvoa de Lanhoso is 132.5 square kilometers.
The area of Bejucal de Ocampo is 82 square kilometers.