Question: All circular triangles are plane figures. All circular triangles are three-sided figures. Therefore, some three-sided figures are plane figures. Use Venn diagrams to determine whether
All circular triangles are plane figures.
All circular triangles are three-sided figures.
Therefore, some three-sided figures are plane figures.
Use Venn diagrams to determine whether the following standard-form categorical syllogisms are valid from the Boolean standpoint, valid from the Aristotelian standpoint, or invalid. Then, identify the mood and figure, and cross-check your answers with the tables of valid syllogisms found in Section 5.1.
Tables From Section 5.1:


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