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Lines, Line Segments, and Rays
Types of Lines
Polygons
Geometry Vocabulary
Angles
100
This is a straight line that goes on and on in both directions.
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
It has four sides and four angles.
What is a square?
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 are lines that will never touch.

Parallel 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
This is named for the starting point and another point somewhere along the way and in that order.
What is a ray?
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
A triangle with all sides equal.
What is an equilateral triangle?
500
These are stop along the way of a line, line segment, and ray, and are usually named with a letter.
What are points?
500
An example is an intersection with traffic lights.
What are intersecting 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
A triangle with two sides the same length.
What is an isosceles triangle?