Question 1

What is the relationship between the radius and the diameter of a circle?

Accepted Answer

Diameter is twice the radius

Answer

Radius is equal to the diameter

Answer

Radius is twice the diameter

Answer

Diameter is half the radius

Question 2

If the diameter of a circle is 10 units, what is the radius?

Accepted Answer

5 units

Answer

15 units

Answer

10 units

Answer

20 units

Question 3

Which formula represents the circumference of a circle?

Accepted Answer

C = 2πr

Answer

C = πd

Answer

C = πr^2

Answer

C = r^2

Question 4

How do you calculate the diameter if you know the circumference?

Accepted Answer

Divide the circumference by π

Answer

Multiply the circumference by 2

Answer

Subtract the radius from the circumference

Answer

Add the circumference and the radius

Question 5

What does the variable r represent in the formula C = 2πr?

Accepted Answer

Radius

Answer

Circumference

Answer

Area

Answer

Diameter

Question 6

If the circumference of a circle is 31.4 units, what is the approximate diameter?

Accepted Answer

10 units

Answer

31.4 units

Answer

15.7 units

Answer

6.28 units

Question 7

How is the circumference related to the diameter?

Accepted Answer

Circumference is π times the diameter

Answer

Circumference is the diameter divided by π

Answer

Circumference is half the diameter

Answer

Circumference is the square of the diameter

Question 8

If the radius of a circle is 7 units, what is the circumference? (Use π ≈ 3.14)

Accepted Answer

43.96 units

Answer

21.98 units

Answer

49 units

Answer

14 units

Question 9

What is the value of π approximately?

Accepted Answer

3.14

Answer

4

Answer

1.62

Answer

2.71

Question 10

If the circumference of a circle is known, how can the radius be found?

Accepted Answer

Divide the circumference by 2π

Answer

Subtract π from the circumference

Answer

Multiply the circumference by π

Answer

Divide the circumference by π

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