4.G.1-3

Front

What are parallel lines?

Back

Lines that never meet and are always the same distance apart.

Front

What are perpendicular lines?

Back

Lines that intersect at a right angle (90 degrees).

Front

What is a line segment?

Back

A part of a line that has two endpoints.

Front

What is an angle?

Back

A figure formed by two rays (sides of the angle) that share a common endpoint (the vertex).

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An angle that measures more than 90 degrees but less than 180 degrees.

Front

What are intersecting lines?

Back

Lines that cross each other at any angle.

Front

What is a point in geometry?

Back

A location in space that has no size or dimension.

Front

What is a line in geometry?

Back

A straight path that extends infinitely in both directions.