Geometry Vocabulary

an angle that measures less than 90*

• acute angle

• obtuse angle

• right angle

• straight angle

lines that meet or cross at a point

• parallel lines

• perpendicular lines

• intersecting lines

a set of points that form a straight path that goes forever in both directions

• ray

• line segment

• point

• line

an angle that measures greater than 90* but less than 180*

• acute angle

• obtuse angle

• straight angle

• right angle

lines that never intersect and are always the same distance apart

• perpendicular lines

• intersecting lines

• parallel lines

part of a line that begins at one endpoint and continues without end in one direction

• ray

• point

• line segment

• line

an angle that measures exactly 90*

• acute angle

• obtuse angle

• straight angle

• right angle

part of a line between two points on the line (endpoints)

• ray

• line

• line segment

• point

lines that intersect at right angles to form a right angle

• parallel lines

• perpendicular lines

• points

• intersecting lines

An exact location in space

• angle
• line
• point
• ray