Circle is a set of points equidistant from a fixed center called radius. Center at origin is (0,0). General equation for any circle is (x-h)²+(y-k)²=r²
Bayes' theorem: P(A) = ∑P(A | E_i)P(E_i). Conditional probability: P(E_i | A) = (P(E_i)P(A | E_i))/P(A)