1. Point An exact position or location in a given plane.
Is represented by a dot and named with a capital letter.
Point A or Point B

2. Line
The set of points between points P and Q in a plane and the infinite number of points that continue beyond the points.
Written as Q P

3. Line Segment
A line with two endpoints.
Written as

4. Ray
A line that has one endpoint and continues on forever in the opposite direction. B C D E A

5. Circle
The set of points on a plane at a certain distance, or radius, from a single point, the center

6. Angle
Made up of 2 rays joined together at a common point called a vertex.
The angle is

7. Perpendicular Line Two lines that intersect at a right angle (90°).
Written as

8. Parallel Line
Lines in a plane that either do not share any points and never intersect, or share all points.
Written as

9. Degrees
The unit of measure for angles.

10. Acute Angle
An angle measuring less than 90° but greater than 0°.

11. Right Angle
An angle that measures 90°.

12. Obtuse Angle
An angle measuring greater than 90° but less than 180°.

13. Straight Angle
An angle measuring exactly 180°.

14. Adjacent Angles Two angles that share a common vertex and side.
SIDE BY SIDE

15. Vertical Angles
Two angles directly across from each other. They share a common vertex. h f e g

16. Complementary Angles
Two angles that add up to 90 degrees. 1 2

17. Supplementary Angles
Two angles that add up to 180°. 1 2

18. Interior Angle = Inside AngleB C
Exterior Angle= Outside Angle

19. Pre-image
The original figure before undergoing a transformation.

20. Image
The new, resulting figure after a transformation

21. * Translations
(Slide your image over)
* image
* preimage

22. * Reflections
(Flip your image over)
* preimage
* image

23. * Rotations
(Turn your image
about a fixed point)
* image
* preimage

24. Congruent
Figures are congruent if they have the same shape, size, lines, and angles.