∴ A is equal to two right angles.
(6) Figure of Speech.
This fallacy results from assuming that words of the same root have the same meaning. Since the same root-word may be used as a noun, verb, adjective, etc., it does not follow that in these various forms it retains a common meaning. “Address” as a noun and “address” as a verb convey two distinct meanings.
The following are examples of this fallacy:
(a) No designing person should be trusted,
This architect is a designer,
∴ This architect should not be trusted.
(b) Justifiable investigation is wise,
This man is a just investigator,
∴ This man is wise.