Geometry 2.4, Biconditional statements & Definitions, iff, p→q and q→p

How a Conditional statement and its Converse make a Biconditional statement, the use of “if and only if” as “iff”, or a double arrow as notation, writing Biconditionals from a given statement or a definition, why a Biconditional would be false, and understanding why a figure does not fit the definition of a polygon.

High School Geometry
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