Question

Which of the following can be calculated using the formula ?

A.
Area of a circle

B.
Circumference of a circle

C.
Arc length of a circle

D.
Diameter of a circle

Answer 1

The formula C = π2r

Is used for the circumference.

Which of the following can be calculated using the formula?

We know that the number π is defined as the quotient between the circumference of a circle and its diameter, so we can write:

C/d = π

And remember that the diameter is twice the radius, so we can write:

d = 2r

Then we can rewrite the equation for the circumference as:

C = π2r

Then we conclude that the correct option is B.

If you want to learn more about circles:

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