Vocabulary and Notations in Geometry

A ___________ is an exact location. It has no size, no dimensions, only position.

• Point

• Line

• Segment

• Ray

• Parallel Lines

A ____________________ is straight (no bends), has no thickness, and extends in both directions without end (infinitely).

• Perpendicular Lines

• Parallel Lines

• Line

• Segment

• Ray

A ______________ is the part of a line that connects two points. It is the shortest distance between the two points. It has a length.

• Line

• Segment

• Ray

• Parallel Lines

• Perpendicular Lines

A _____________ is part of a line with a start point but no end point (it goes to infinity).

• Line

• Segment

• Point

• Ray

• Perpendicular Lines

___________________ are lines that are always the same distance apart (called "equidistant"), and will never meet

• Lines

• Segments

• Perpendicular Lines

• Parallel Lines

• Rays

____________________ are lines that are at right angles (90°) to each other.

• Perpendicular Lines

• Parallel Lines

• Lines

• Segments

• Rays

An _______ is formed between two rays with the same endpoint and is measured in degrees.

• vertex

• angle

• edge

The point connecting lines, segments, or rays is called the ____________.

• vertex

• edge

• angle

An angle is __________ when it measures less than 90°.

• acute

• obtuse

• right

• straight

• reflex

An angle is __________ when it measures 90° exactly.

• acute

• obtuse

• right

• straight

• reflex