Circumference and Diameter Quiz

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

• The radius is twice the diameter.

• The diameter is half the circumference.

• The diameter is twice the radius.

• The radius is half the circumference.

Which formula would you use to find the circumference if you know the radius?

• C = 2D

• C = πD

• C = 2πR

• C = πR²

If the radius of a circle is 12, what is the circumference?

• 48π

• 36π

• 24π

• 12π

Given a circumference of 17π, what is the diameter of the circle?

• 34

• 17π

• 8.5

• 17

Which formula is used to find the diameter if the circumference is known?

• D = C/π

• D = 2C

• D = πC

• D = C²