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Circles Review

Circles Review. To complete this review, you will need the following: *Pencil *Scrap paper *Calculator *Formulas *Vocabulary cards. Part 1: Vocabulary. On the following slides you will find definitions for the eight vocabulary words about circles.

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Circles Review

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  1. Circles Review 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 ft2 5 ft

  17. R,D,C,A #2 • Radius? • 4 in • Diameter? • 8 in • Circumference? • 25.12 in • Area? • 50.24 in2

  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/parts-of-a-circle

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