Unit 1 Vocab

Undefined terms

• Point

• Ray

• Line

• Plane

• Chord

Inverse

• a statement that has been proven

• a statement that can be written in if-then form

• If not p, then not q

• If q, then p

Contrapositive

• to guess

• statement formed by negating both the hypothesis and conclusion of the converse of a conditional statement

  If not q, then not p

• If not p, then not q

• the process of applying a general statement to specific facts or situations

Counterexample

• an example that proves that a conjecture or statement is false

• to guess

• Having the same measure

• A logical argument that shows a statement is true.

Deductive reasoning

• Having the same measure

• a statement that can be written in if-then form

• a statement that has been proven

• process of applying facts or testing to prove something

Congruent

• to guess

• a statement that is accepted as true without proof

• Having the same measure

• a statement that can be written in if-then form

Midpoint

• A point that divides a segment into two congruent segments

• point, line & plane

• whether a statement is true or false

• If not p, then no q

Proof

• A logical argument that shows a statement is false

• A logical argument that shows a statement is true.

• a statement that has been proven

• to guess

Conditional statement

• A proven example

• statement that can be written in if-then form

• Having the same measure

• whether a statement is true or false

Postulate

• the statement formed by exchanging the hypothesis and conclusion of a conditional statement. If p, then q

• a guess

• a statement that is accepted as true without proof

• a statement that can be written in if-then form