This document defines and describes basic geometry terms including: point, line, line segment, ray, plane, parallel lines, intersecting lines, angles, and the four angle types - right, straight, acute, and obtuse. Key details provided include definitions of each term, examples, and illustrations to demonstrate the concepts.

1. Geometry
Point
Line
Line segment
Ray
Plane
Parallel lines
Intersecting lines
Angles

2. Geometry
Point
An exact location in
space
Line
.A
An endless collection
of points along a
straight path
Line segment
Part of a line that has
two endpoints

3. Geometry
Ray
Part of a line that has
one endpoint and
extends endlessly in
the other direction
Plane
An endless, flat surface .C
.B
that is named by any .A
three points not on the
same line.

4. Geometry
Parallel Lines
Lines do not intersect
but are in the same
plane
Intersecting Lines
Lines meet at one point
Perpendicular Lines
Lines form a right
angle

5. Angles
An angle is formed when two rays have the
same endpoint.
This endpoint is called the vertex.
The two rays that form the angle are called
sides.

6. Angles
There are four types of angles
Right angle
Straight angle
Acute angle
Obtuse angle

7. Right Angles
Forms a square corner
Forms a 90 degree
angle.
90
degrees
Use a corner of your
index card to make
sure you a have a right
angle

8. Straight Angle
Forms a straight line
Angle is 180 degrees
180 degrees
Use the edge of your
index card to make
sure you have a
straight angle.

9. Acute Angles
Forms an angle that is
less than a right angle
Angle is less than 90
degrees

10. Obtuse Angles
Form an angle that is
more than a right
angle
Angle is more than 90
degrees

11. Review
Name each picture
Ray 1.
2.
Parallel lines
3.
Line

12. Review
Name each picture
Acute angle
4.
5.
Line segment
6.
Point

13. Review
Name each picture
Intersecting lines
Perpendicular and
Intersecting lines
Plane