Points, Lines, & Angles Vocabulary

Front

What are lines in a plane that cross at exactly one point?

Back

Intersecting lines are lines in a plane that cross at exactly one point, forming four angles.

Front

What are lines in a plane that intersect to form four right angles?

Back

Perpendicular lines are lines in a plane that intersect to form four right angles.

Front

What is a part of a line that has two endpoints?

Back

A line segment is a part of a line that has two endpoints.

Front

What is a point?

Back

A point is a specific location in space that has no size or dimension.

Front

What is a line?

Back

A line is a straight path that extends infinitely in both directions.

Front

What is a ray?

Back

A ray is a part of a line that has one endpoint and extends infinitely in one direction.

Front

What do we call angles that are less than 90 degrees?

Back

Acute angles are angles that measure less than 90 degrees.

Front

What do we call angles that are exactly 90 degrees?

Back

Right angles are angles that measure exactly 90 degrees.

Front

What do we call angles that are greater than 90 degrees but less than 180 degrees?

Back

Obtuse angles are angles that measure greater than 90 degrees but less than 180 degrees.

Front

What are two lines that never intersect called?

Back

Parallel lines are two lines in a plane that never intersect.