Unit 1.1 Test Review L

Front

What are coplanar points?

Back

Points that lie on the same plane.

Front

What does it mean for two lines to be parallel?

Back

Two lines that do not intersect and are equidistant from each other.

Front

What is a counterexample?

Back

An example that disproves a statement or proposition.

Front

What is the notation for a line segment?

Back

Front

What does it mean for points to be collinear?

Back

Points that lie on the same straight line.

Front

If three points are coplanar, are they always collinear?

Back

No, they are sometimes collinear.

Front

What is the difference between intersecting and parallel lines?

Back

Intersecting lines cross each other; parallel lines never meet.

Front

How can you prove that two lines are not parallel?

Back

By showing that they intersect at a point.

Front

What is the correct notation for a ray?

Back

A ray is denoted by its endpoint and another point, e.g., @@ ightarrow{AB} @@.

Front

What is the significance of a counterexample in logic?

Back

It demonstrates that a general statement is not universally true.