Question: 11. All circular triangles are plane fi gures. All circular triangles are three-sided fi gures. Th erefore, some three-sided fi gures are plane fi gures.

11. All circular triangles are plane fi gures.

All circular triangles are three-sided fi gures.

Th erefore, some three-sided fi gures are plane fi gures. 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. Th en, identify the mood and fi gure, and cross-check your answers with the tables of valid syllogisms found in Section 5.1.

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