Question

An undefined term cannot be used in a theorem. True OR False.

Answer 1

A theorem is a notion that is accepted  as a truth through mathematical and experimental proofs. If there is an undefined term, then it is not considered as a truth. An undefined term means that something is wrong with the line with proof. answer is false

Answer 2

The correct answer is:

False.

Explanation:

An undefined term can be used in a proof.

There are three fundamental undefined terms in geometry: point, line and plane. All three of these can be used in a proof; therefore the statement that an undefined term cannot be used in a proof is false.