Points, lines, rays, and angles

Front

What is a point?

Back

An exact location.

Front

What is a line?

Back

A straight path that extends infinitely in both directions.

Front

What is a ray?

Back

A part of a line that starts at a point and extends infinitely in one direction.

Front

What is an angle?

Back

The figure formed by two rays with a common endpoint.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is a right angle?

Back

An angle that measures exactly 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 perpendicular lines?

Back

Lines that intersect to form right angles.

Front

What are parallel lines?

Back

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

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.