Lines, Line Segments, and Rays
Types of Lines
Polygons
Geometry Vocabulary
Angles
100

This is an infinite number of points that goes on forever in either direction.

What is a line?

100
These lines are the same distance apart ALWAYS.
What are parallel lines?
100
It has three sides and three angles.
What is a triangle?
100
A 2 dimensional figure with three or more sides that is closed.
What is a polygon?
100
A 90 degree angle.
What is a right angle?
200
This looks like a line, but has a beginning and end.
What is a line segment?
200
These lines will cross.
What are intersecting lines?
200

The general name for a figure with four sides and four angles.

What is a quadrilateral?

200

A four sided polygon.

What is a quadrilateral?

200
An angle that is smaller than 90 degrees.
What is an acute angle?
300
This has a starting point, but goes on and on in one direction.
What is a ray?
300

These lines form a right angle.

What are perpendicular lines?

300
It has five sides and five angles.
What is a pentagon?
300
One of the line segments that make up a polygon.
What is a side?
300
An angle that is bigger than 90 degrees.
What is an obtuse angle?
400

A flat surface or "slice" of space.

What is a plane?

400
An example is railroad tracks.
What are parallel lines?
400
It has six sides and six angles.
What is a hexagon?
400
The corner, or point at which line segments meet in a polygon.
What is a vertex?
400

Angles that share a side.

What are adjacent angles?

500

These are stops along the way of a line, line segment, and ray, and are usually named with a letter.

What are points?

500

These lines will never cross but are not parallel.

What are skew lines?

500
It has eight sides and eight angles.
What is an octagon?
500
A quadrilateral with two pairs of opposite and parallel sides.
What is a parallelogram?
500

Adjacent angles that are supplementary.

What is a linear pair?

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