- How many parallel sides does a Octavian have?

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What are the center and radius of the circle defined by the equation x2 plus y2-6 plus 8y plus 210? What is the nth term of the arithmetic sequence 7 5 3 1? What is utility of coordinate geometry? What is the maximum number of possible intersections of the given loci a pair of concentric circles and a line? What is the sum of the first five hundred even numbers not counting zero?