Lines, Line Segments, and Rays

Types of Lines

Polygons

Geometry Vocabulary

Angles

This is a straight line that goes on and on in both directions.

What is a line?

These lines are the same distance apart ALWAYS.

What are parallel lines?

It has three sides and three angles.

What is a triangle?

A 2 dimensional figure with three or more sides that is closed.

What is a polygon?

A 90 degree angle.

What is a right angle?

This looks like a line, but has a beginning and end.

What is a line segment?

These lines will cross.

What are intersecting lines?

It has four sides and four angles.

What is a square?

A four sided polygon.

What is a quadrangle?

An angle that is smaller than 90 degrees.

What is an acute angle?

This has a starting point, but goes on and on in one direction.

What is a ray?

These lines are not touching, but if you extended them out, they would.

What are intersecting lines?

It has five sides and five angles.

What is a pentagon?

One of the line segments that make up a polygon.

What is a side?

An angle that is bigger than 90 degrees.

What is an obtuse angle?

This is named for the starting point and another point somewhere along the way and in that order.

What is a ray?

An example is railroad tracks.

What are parallel lines?

It has six sides and six angles.

What is a hexagon?

The corner, or point at which line segments meet in a polygon.

What is a vertex?

A triangle with all sides equal.

What is an equilateral triangle?

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

What are points?

An example is an intersection with traffic lights.

What are intersecting lines?

It has eight sides and eight angles.

What is an octagon?

A quadrilateral with two pairs of opposite and parallel sides.

What is a parallelogram?

A triangle with two sides the same length.

What is an isosceles triangle?