Astatement true in its original and converse rewritten in “if and only if” form

an "if, then" statement is conditional

"if and only if" means the statement is true in either direction (biconditional).

For example: She is pretty if and only if she is smart

means

If she is pretty, then she is smart. AND If she is smart, then she is pretty.

biconditional statement

square pyramid

step-by-step explanation:

square prism looks like nothing like that

triangular prism has a rectangular base instead of a square base

tetrahedron has a triangular base