circles review

To complete this review, you will need the following:*Pencil

*Scrap paper*Calculator*Formulas

*Vocabulary cards

Part 1: VocabularyOn 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!

Vocabulary #1Any line segment that connects

the center to a point on the circleAnswer: Radius

Vocabulary #2An angle whose vertex is the

centerAnswer: Central angle

Vocabulary #3The distance around the circleAnswer: Circumference

Vocabulary #4Any line segment that connects

2 points on the circleAnswer: Chord

Vocabulary #5A closed plane figure made up of

all the points the same distance from the center

Answer: Circle

Vocabulary #6Any line segment through the

center that connects 2 points on the circle

Answer: Diameter

Vocabulary #7The space enclosed within a

circleAnswer: Area

Vocabulary #8The middle of the circle; how the

circle is namedAnswer: Center

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!

Vocabulary #1What is the blue line called?

Answer: Chord AB

Vocabulary #2What is this line segment called?

Answer: Radius QR

Vocabulary #3What is line segment QR called?

Answer: Diameter

Part 3: Area and CircumferenceOn 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!

R,D,C,A #1Radius? 5 ftDiameter? 10 ftCircumference? 31.4 ftArea? 78.5 ft2

5 ft

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

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-circumferen

ce-and-area-of-a-circlehttp://www.ixl.com/math/grade-5/parts-of-a-circle