An interactive presentation about basic geometry concepts like lines, line segments, points, and rays.

1. By Kelly Boushell Submitted June 5 th , 2010 Dr. Sims ITC 525 Computers for Educators A REVIEW OF BASIC CONCEPTS BEGIN

2. Table of Contents “ Choose one of the topics above to begin.” “ When you are ready to begin another topic click on me at the bottom of the screen to come back to the table of contents.” Points Line Segments Lines Rays Angles Citations Standards

3. POINT A point is a location in space. Capital letters are used to name points. A K G M More info here! Table of Contents Watch movie!

4. LINE SEGMENT A line segment is made up of 2 points and the straight path between them. The two points at the ends of a line segment are called endpoints . This line segment is called: N D ND or DN Table of Contents More info here! Quiz Me!

5. Quiz Me! 1. What is the name of this geometric figure? B. Line Segment A. Line C. Ray M E Table of Contents BACK

6. Try Again What is the name of this geometric figure? B. Line Segment A. Line C. Ray M E Table of Contents Need a little help? BACK

7. Fabulous! What is the name of this geometric figure? B. Line Segment M E You remembered a line segment is made up of 2 points and the straight path between them! Table of Contents

8. LINE A line is a straight path that goes on forever in both directions. The arrowheads symbolize the line continuing forever, even though it looks like it stops at the arrowheads. R and J are points , not end points! J R This line is called: RJ or JR Table of Contents More info here! Quiz Me!

9. Quiz Me! What is the name of this geometric figure? A. Line B. Line Segment C. Ray H Z Table of Contents BACK

10. Try Again What is the name of this geometric figure? A. Line B. Line Segment C. Ray H Z Table of Contents Need a little help? BACK

11. Superb! What is the name of this geometric figure? A. Line H Z Table of Contents You remembered a line is a straight path that goes on forever in both directions!

12. RAY A ray is a straight path that has a starting point and goes on forever in one direction . Note the difference between point and endpoint! The endpoint is always the first letter in the name of a ray! B W This is point B This is endpoint W This ray is called: WB Table of Contents More info here! Quiz Me!

13. Quiz Me! 3. What is the name of this ray? D O A. OD C. DO B. OD Table of Contents BACK

14. Try Again 3. What is the name of this ray? D O A. OD C. DO B. OD Table of Contents Need a little help? BACK

15. Fantastic! 3. What is the name of this ray? D O A. OD You remembered that the endpoint is always the first letter in the name of a ray! Table of Contents

16. ANGLE An angle is formed by 2 rays or 2 line segments that share the same endpoint. The endpoint where the rays or segments meet is called the vertex of the angle. The rays or segments are called the sides of the angle. NEXT Table of Contents More info here!

17. Naming Angles The vertex of the angle must always be in the middle of the, between the points on the sides . A B C This angle is called: or NEXT ABC The vertex point is B. That is why B is in the middle of the sides A and C. CBA Table of Contents BACK

18. Classifying Angles Table of Contents More info here! Quiz Me! Watch movie! Straight Angle Measures exactly 180 Acute Angle Measures between 0 and 90 Reflex Angle Measures between 180 and 360 Obtuse Angle Measures between 90 and 180 Right Angle Measures exactly 90 BACK

19. Quiz Me! 4. What is the classification of this angle? A. Acute Angle B. Reflex Angle C. Obtuse Angle Table of Contents BACK

20. Try Again 4. What is the classification of this angle? A. Acute Angle B. Reflex Angle C. Obtuse Angle Table of Contents Need a little help? BACK

21. Awesome! 4. What is the classification of this angle? C. Obtuse Angle Table of Contents You remembered that an obtuse angle measures between 90 and 180 !