Math quiz tom. 9/6/19

is statement based on known information or observation that is believed to be true but not yet proven

conjecture

is an example that is used to disprove a statement; it contradicts a statement or argument

counterexample

in geometry gives the meaning of a term based only on commonly understood words, undefined terms, or other previously defined terms

definition

is a statement that is accepted in geometry without proof. In the same way that you can use undefined terms to help define other terms, you can use postulates to help prove other statements

postulate/axiom

is a characteristic of all members of a set. Properties can be used as justifications of steps in a proof, just like axioms or previously proved theorems

property

is a statement that has been proved using definitions, postulates, properties, previously proven theorems, and logical reasoning

theorem