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Continue to ChatArea formulas for a triangle in the alpha plane - https://avesis.ogu.edu.tr/yayin/848c4c4c-6fd2-432f-a5b1-3c3fd59a65e2/area-formulas-for-a-triangle-in-the-alpha-plane
Area formulas for a triangle in the alpha plane - https://avesis.ogu.edu.tr/yayin/848c4c4c-6fd2-432f-a5b1-3c3fd59a65e2/area-formulas-for-a-triangle-in-the-alpha-plane