Question 1

What is the formula for calculating the circumference of a circle using its diameter?

Accepted Answer

C = πd

Answer

C = r/π

Answer

C = πr^2

Answer

C = 2πr

Question 2

How do you find the diameter if you know the radius of a circle?

Accepted Answer

Diameter is twice the radius

Answer

Diameter is half the radius

Answer

Diameter is π times the radius

Answer

Diameter is equal to the radius

Question 3

What is the approximate value of π?

Accepted Answer

3.14

Answer

2.72

Answer

1.62

Answer

4

Question 4

If the radius of a circle is 4 units, what is the circumference? (Use π ≈ 3.14)

Accepted Answer

25.12 units

Answer

31.4 units

Answer

12.56 units

Answer

50.24 units

Question 5

What relationship does the diameter have to the radius?

Accepted Answer

Diameter is twice the radius

Answer

Diameter is equal to the radius

Answer

Diameter is half the radius

Answer

Diameter is the radius squared

Question 6

How is the circumference of a circle related to its radius?

Accepted Answer

The circumference is 2π times the radius

Answer

The circumference is πr^2

Answer

The circumference is πr

Answer

The circumference is r/2

Question 7

If a circle has a diameter of 10 units, what is its circumference? (Use π ≈ 3.14)

Accepted Answer

31.4 units

Answer

10 units

Answer

20 units

Answer

15.7 units

Question 8

What happens to the circumference if the diameter of a circle is doubled?

Accepted Answer

The circumference doubles

Answer

The circumference quadruples

Answer

The circumference is halved

Answer

The circumference stays the same

Question 9

How can you find the radius if you know the circumference of a circle?

Accepted Answer

Divide the circumference by 2π

Answer

Divide the circumference by π

Answer

Subtract π from the circumference

Answer

Multiply the circumference by π

Question 10

If the circumference of a circle is 62.8 units, what is the radius? (Use π ≈ 3.14)

Accepted Answer

10 units

Answer

15 units

Answer

20 units

Answer

5 units

Related quizzes

Related quizzes