Unit Review= Circumference of a Circle

#1 Look at the circle with center O.

The line segment AB appears to be

• circumference

• perimeter

• diameter

• radius

#2 The top part of this hat is shaped like a cylinder with a diameter of 7 inches.  

Which measure is closest to the length of the band that goes around the outside of the hat?

• 10.1

• 11

• 22.0

• 38.5

#3

Which of the following best describes the meaning of π?

• A   the measurement of the circumference of a circle

• B   the measurement of the diameter of a circle

• C   the ratio of the circumference of a circle to its diameter

• D   the ratio of the radius of a circle to its circumference

#4

Erin is designing a circular garden for the entrance to the school.  If the radius is 3 meters, how many meters of edging will Erin need to surround the garden?

• A 6.14 meters

• B 9.42 meters

• C 18.84 meters

• D 28.26 meters

#5

Valentin drew the circle below.

What is the approximate circumference of the circle Valentin drew?

• A 11 inches

• B 22 inches

• C 24.5 inches

• D 38.5 inches

#6

The diameter of Neveah’s circle was 20 inches.  Which statement is TRUE about Neveah’s circle?

• A Dividing the circumference of the circle by 20 inches is nearly equal to 3.14.

• B Dividing 20 inches by the circumference of the circle is exactly equal to 3.14.

  
  

• C Multiplying the circumference by 20 inches is nearly equal to 3.14.

• D  Multiplying 20 inches by the circumference is exactly equal to 3.14.

#7

The city council wants to have a circular walking trail around the park.  

About how long will the walking 

trail be?

• A 2 miles

• B 6 miles

• C 8 miles

• D 12 miles

#8

Which measurement is closest to the circumference of the circle below?

• A 10 inches

• B 15 inches

• C 25 inches

• D 30 inches

#9

The radius of Nyya’s circular mirror is inches.  What is the approximate circumference of her mirror?

• A 8.24 inches                  

• B 16.49 inches

• C 32.97 inches                

• D 86.55 inches

#10

Enoch baked a round cake with a diameter of 12 inches.  He put a ring of frosting around the outer edge of the top of the cake.  How many inches of frosting did Enoch put around the top of the cake? 

(Round your answer to the nearest inch).

• A 19                   

•    B 38

• C 75 

• D 113