3. Pi is defined as the ratio of the circumference of a circle to the diameter of that circle. Which of the
following correctly explains why the formula for the circumference of a circle is 2xr?

Pi times r equals the diameter of the circle. The diameter is a half circle, so when you multiply it by 2, you get the distance around the entire circle, or the circumference.

the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.