Lines, angles, and Triangles

Front

What is a horizontal line?

Back

A line that runs left to right and is parallel to the horizon.

Front

What is a vertical line?

Back

A line that runs up and down and is perpendicular to the horizon.

Front

What is a ray?

Back

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

Front

What is a right triangle?

Back

A triangle that has one right angle (90 degrees).

Front

How are triangles classified?

Back

Triangles are classified by equal sides and types of angles.

Front

What is an angle?

Back

An angle is formed by two rays that share a common endpoint.

Front

What are parallel lines?

Back

Lines that never intersect 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 acute angle?

Back

An angle that measures less than 90 degrees.