Knowledge involves belief. It is a necessary part of knowing, for no one can know something unless he believes it. 2) A person can only know things that are true. An individual can think she knows something to be true but, in fact, be wrong. 3) A person can believe something to be true, that is in fact true, but it wouldn’t constitute knowledge if it lacks proper justification. Knowledge involves some form of confirmation or evidence.
First off, as I have noted to others, these qualities of knowledge you assert are a matter of philosophy rather than language.
That said, let us explore this a little closer. You assert on point #2 that A person can THINK they know something, but that whether or not it qualifies as knowledge is dependent upon it actually being true.
Justifying a belief is good - but there is little to nothing that we can prove to be true beyond things we define ourselves (such as in mathematics).
As such, even if we accepted that the essential quality that defines knowledge is that it is true - it simply becomes impractical to speak of knowledge since we cannot prove that our justified beliefs are true.
Newtonian Physics, for instance, must be rejected as ever having been knowledge in so far as it has been superseded by Relativity.
Indeed, science never proves anything, but only disproves hypotheses and theories. As such, based upon your proposed understanding of knowledge, science can only be said to provide us with justified beliefs that may or may not be knowledge.