1951 AMC 12 Question 14
AMC12 · 1951 AMC 12
In connection with proof in geometry, indicate which one of the following statements is incorrect:
Some statements are accepted without being proved.
In some instances there is more than one correct order in
proving certain propositions.
Every term used in a proof must have been
defined previously.
It is not possible to arrive by correct reasoning at a true
conclusion if, in the given, there is an untrue proposition.
Indirect proof can be used whenever there are two or more
contrary propositions.