Lines and Angles Vocabulary

Lines that run from left to right

• parallel line

• horizontal line

• line

• vertical line

Two lines that stay the same distance apart and never intersect

• vertical lines

• parallel lines

• intersecting lines

• horizontal lines

A portion of the line with two endpoints

• line segment

• intersecting lines

• vertical lines

• perpendicular lines

Lines that run up and down

• perpendicular lines

• horizontal lines

• intersecting lines

• vertical lines

Two lines that meet or cross at any given point

• parallel lines

• vertical lines

• intersecting lines

• perpendicular lines

An angle that measures LESS than 90 degrees

• acute angle

• obtuse angle

• straight angle

• right angle

A line that travels to infinity in both directions

• perpendicular lines

• ray

• line segment

• line

Two lines that intersect to make at least one 90 degree

• acute angle

• parallel lines

• ray

• perpendicular lines

An angle that measures exactly 90 degrees

• obtuse angle

• acute angle

• right angle

• vertical line

An angle that measures greater than 90 degrees

• acute angle

• obtuse angle

• right angle

• line segment