1. To complete this review, you will need the following: *Pencil *Scrap paper *Calculator *Formulas *Vocabulary cards

2. Part 1: Vocabulary On the following slides you will find definitions for the eight vocabulary words about circles. The definition will automatically appear when you advance to the slide. Read the definition and choose the correct word from your flashcards. Click the slide again to see if you were correct. Good luck!

3. Vocabulary #1 Any line segment that connects the center to a point on the circle Answer: Radius

4. Vocabulary #2 An angle whose vertex is the center Answer: Central angle

5. Vocabulary #3 The distance around the circle Answer: Circumference

6. Vocabulary #4 Any line segment that connects 2 points on the circle Answer: Chord

7. Vocabulary #5 A closed plane figure made up of all the points the same distance from the center Answer: Circle

8. Vocabulary #6 Any line segment through the center that connects 2 points on the circle Answer: Diameter

9. Vocabulary #7 The space enclosed within a circle Answer: Area

10. Vocabulary #8 The middle of the circle; how the circle is named Answer: Center

11. Part 2: Vocabulary On the following slides, you will find pictures of circles. Use your vocabulary words to identify the part shown. Don’t forget to use the letter names. (ex: line segment AB) Good luck!

12. Vocabulary #1 What is the blue line called? Answer: Chord AB

13. Vocabulary #2 What is this line segment called? Answer: Radius QR

14. Vocabulary #3 What is line segment QR called? Answer: Diameter

15. Part 3: Area and Circumference On the following slides you will find pictures of circles labeled with either a radius or diameter. On your scrap paper, write down the radius, diameter, circumference, and area. (Use your formula sheets and calculator.) You can check each answer as you go by clicking on the slide. Good luck!

16. R,D,C,A #1 Radius? 5 ft Diameter? 10 ft Circumference? 31.4 ft Area? 78.5 ft 2 5 ft

17. R,D,C,A #2 Radius? 4 in Diameter? 8 in Circumference? 25.12 in Area? 50.24 in 2

18. Keep up the great work! If you need more practice, remember—I handed out a practice sheet in class on Friday with 6 area/circumference problems. You can always draw a circle, pick a number for the radius or diameter, then solve using the formulas. You can use these websites to practice up to 20 problems per day. http://www.ixl.com/math/grade-5/radius-diameter- circumference-and-area-of-a-circle http://www.ixl.com/math/grade-5/radius-diameter- circumference-and-area-of-a-circle http://www.ixl.com/math/grade-5/parts-of-a-circle