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If the diameter of a circle is 22, what is the circumference?

Answer 1

Caroline Aucoin

See a solution process below:

The relationship between the diameter and the radius is:

#d = 2r#

The formula for the circumference of a circle is:

#C = 2pir# or #C = 2rpi#

Because #d = 2r# we can substitute as: #C = dpi#

We can now calculate the circumference of the circle in the problem as:

#C = 22pi#

If we want to approximate #pi# as 3.14 we get:

#C ~= 22 * 3.14#

#C ~= 69.08#

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Answer 2

Jayden Jackson

The circumference of a circle with a diameter of 22 is approximately 69.12 units.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.