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Diameter and Circumference (Grade 9)

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Diameter and Circumference

1. 
What is the circumference of a circle with a diameter of 4 inches?
  1. 13.5 in
  2. 12.6 in
  3. 11.2 in
  4. 12.3 in
2. 
What is the radius of a circle with a circumference of 30.4 feet?
  1. 4.8 ft
  2. 3.4 ft
  3. 6.3 ft
  4. 9.7 ft
3. 
Charlotte measures the distance from the center of a circular garden to its edge and finds it is 43 meters. How long is the path which goes around the outside of the garden?
  1. 90 m
  2. 135 m
  3. 180 m
  4. 270 m
4. 
What is the circumference of a circle with a diameter of 18 inches?
  1. 14.2 in
  2. 28.3 in
  3. 56.5 in
  4. 63.8 in
5. 
The hand on a clock is 4 inches long and just fits inside the clock face. What distance does the tip of the clock hand travel during each revolution?
  1. 25 in
  2. 13 in
  3. 4 in
  4. 8 in
6. 
The blade on a helicopter is 3.2 meters long. If the blades turn at 450 revolutions per minute how fast is the tip of the bade traveling?
  1. 151 m/s
  2. 70 m/s
  3. 430 m/s
  4. 15.1 m/s
7. 
Find the diameter of a circle with a perimeter of 25.
  1. 3
  2. 6
  3. 8
  4. 7
8. 
Find the circumference of a circle with a radius of [math]3/(2pi)[/math].
  1. [math](3pi^2)/2[/math]
  2. [math]3[/math]
  3. [math]2/3[/math]
  4. [math].4[/math]
9. 
What is the radius of a circle with a circumference of 14?
  1. [math](2pi)/14[/math]
  2. [math](2pi)/7[/math]
  3. [math]14/pi[/math]
  4. [math]7/pi[/math]
10. 
What is the distance around a circular track with a radius of 67 feet?
  1. 421 ft
  2. 360 ft
  3. 118 ft
  4. 512 ft
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