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.

### 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 are not touching, but if you extended them out, they would.
What are intersecting 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

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?