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### 15 Cards in this Set

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 Define a conjecture. A conjecture is an unproven statement that is based on observation. Inductive reasoning is what? Looking for patterns and making conjectures is part of a process called inductive reasoning. What is a counterexample? A counterexample is an example that shows a conjecture is false. An undefined term is what? An undefined term: You can't define them without using other figures. What are the undefined terms? The undefined terms are point, line and plane. What is a point? A point names a location and has no size. It is represented by a dot. What is a line? A line is a straight path that has no thickness and extends forever. What is a ray? A ray is a part of a line that starts at an endpoint and extends forever in one direction. What is a segment? A segment is two points and all the points in between them. What is a plane? A plane is a flat surface that has no thickness and extends forever. What does the word collinear mean? Points that lie on the same line are collinear. What does the word coplanar mean? Points that lie on the same plane are coplanar. Points that lie on the same line are, besides collinear, what? Coplanar. What are opposite rays? Opposite rays are two rays that have a common endpoint and form a line. What is a postulate? (axiom) A statement that is accepted as true without proof.