Question

Which CANNOT be used in a proof?
A. Theorems
B.Postulates
C.Properties
D.Undefined Terms

Answer 1

postulates, i suppose. :)

Answer 2

No, it must be "undefined terms"

Answer 3

Well, no...

Answer 4

All of those terms may appear in a proof.

By "used in a proof," I don't know what the question author means.

Answer 5

The three undefined terms of classical Euclidean Geometry are point, line, and plane. Those words are used in the theorems, properties, and postulates.

Answer 6

I would agree with postulates

Answer 7

Yeah, I misspoke -- so I followed up with "Well, no..."

Answer 8

But then again I use postulates all the time in geometrical proofs, they're just not always proved themselves so to speak

Answer 9

By "postulates", they just mean "axioms", I believe--those are definitely the starting point.

Answer 10

And once a theorem is proven, it can be used in any subsequent proofs.... Does the book give a definition of "properties"?

Answer 11

Too bad that this is not the question:


Which cannot be used as a reason in a proof?

a. algebra properties
b. postulates
c. conjectures
d. definitions

@cmichelle8814 Just in case, will you check the problem source to determine if the question is posted correctly? Thanks.

Answer 12

undefined terms