The diameter of a circle is 2 cm. What is the circle's circumference? Thanks!

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Answer 1 · 2018-04-09T23:09:31

#C=2picm#

The circumference of a circle is given by

#C=2pir# where #r# is the circle's radius.

Recall that diameter is twice the radius, or, #d=2r#. This shows up in the above circumference formula.

So, we can rewrite the circumference formula as

#C=pid#

Given #d=2cm#,

#C=2picm#