It Is False That Some Four-Sided Triangles Are Commonplace Figures

question 59

Multiple Choice

It is false that some four-sided triangles are commonplace figures. Therefore, some four-sided triangles are not commonplace figures.

• A) Valid, no fallacy.
• B) Invalid, existential fallacy.
• C) Invalid, illicit subcontrary.
• D) Invalid, illicit contrary.
• E) Invalid, illicit subalternation.

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Definitions:

Serosa

The outermost layer of the alimentary canal; also known as the visceral peritoneum.

Serous Fluid

A clear, watery fluid secreted by serous membranes, helping to reduce friction between the internal organs.

Pharynx

Structure below the mouth and nasal cavities that is an organ of the respiratory system as well as the digestive system.

Esophagus

The muscular tube that connects the throat to the stomach, through which food and liquid travel during swallowing.