Geometry Vocabulary

Two lines that intersect to form four right angles

• intersecting lines

• perpendicular lines

• straight angle

An exact location in space

• ray

• line

• point

An angle that forms a square corner

• acute

• obtuse

• right

An angle whose measure is 180 degrees

• obtuse

• right

• straight

Two Lines that cross each other at any point

• parallel lines

• perpendicular lines

• intersecting lines

A straight path of points in a plane that continues without end in both directions with no endpoints

• ray

• line segment

• line

A part of a line that includes two endpoints and all the points between them

• line segment

• ray

• line

An angle that measures greater than 90 degrees and less than 180 degrees

• right

• acute

• obtuse

Lines in the same plane that never intersect and are always the same distance apart

• intersecting

• parallel

• perpendicular

An angle that measures greater than 0 degrees and less than 90 degrees

• right

• obtuse

• acute