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12 questions

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- 1. Multiple-choice2 minutes1 pt
What is the diameter of the circle in the image?

10

20π

20

100

- 2. Multiple-choice2 minutes1 pt
If the diameter of a circle is 4, what is the radius?

4

2π

4π

2

- 3. Multiple-choice2 minutes1 pt
If r = 4, d = ?

4

2

8

8π

- 4. Multiple-choice2 minutes1 pt
If d = 3, r = ?

6

3

1.5

1

- 5. Multiple-choice2 minutes1 pt
Fill in the blank. The circumference of a circle is the ________.

distance around it

space inside it

- 6. Multiple-choice30 seconds1 pt
What is the area of this circle?

4π

8π

16π

π

- 7. Multiple-choice30 seconds1 pt
What is the area of this circle?

25π

10π

π

5π

- 8. Multiple-choice30 seconds1 pt
What is the area of this circle?

12π

6π

144π

36π

- 9. Multiple-choice3 minutes1 pt
What is the area of the circle in the image?

9π

12π

12

36π

- 10. Multiple-choice3 minutes1 pt
What is the area of the circle in the image?

10

20π

100

100π

- 11. Multiple-choice30 seconds1 pt
What is the radius of a circle with an area of 49π?

49

10

7

14

- 12. Multiple-choice3 minutes1 pt
Find the circumference of the circle in the image.

10π

20π

100π

20