Pi is an irrational number, so when we're solving with pi, we usually round it to something like 3.14. If we use 3.14 as pi in this problem, we get 84.78.
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The noun 'favor' is a concrete noun as a word for a small gift or souvenir.Example sentence: The pin was a favor at my club's annual dinner.
If you're only given two points, and you're told that they both lie on a circle,then there are an infinite number of possible circles, and therefore an infinitenumber of possible centers. In order to pin it down, you need three points.