Geometry Vocabulary Basics

Represented by a straight path that extends in two opposite directions without end. It contains infinitely many points

• Line
• Line Segment
• Point
• Ray

Angle that measures less than 90 degrees

• Right Angle
• Acute Angle
• Obtuse Angle
• Perpendicular

Middle point of a line segment

• Point
• Midpoint
• Bisector
• Perpendicular

Lines that do not intersect

• Slope
• Parallel
• Perpendicular
• Equidistant

Two angles that add up to 90 degrees

• Right Angle
• Supplementary Angles
• Complementary Angles
• Straight Angle

Part of a line that contains two endpoints and all points between them

• Line
• Line Segment
• Ray
• Midpoint

Part of a line that consists of one endpoint and all the points of the line on one side of the endpoint

• Line
• Line Segment
• Ray
• Point

Angles that share a common side and a common vertex

• Opposite Ray
• Ray
• Adjacent Angles
• Vertical Angles

Angles that are opposite of each other when two lines cross

• Adjacent Angles
• Vertical Angles
• Supplementary Angles
• Complementary Angles

Lines that intersect and form four 90 degree angles

• Supplementary Angles
• Complementary Angles
• Vertical Angles
• Perpendicular Angles