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The equation for any circle is r2 = (x-a)2 + (y-b)2 Where r is the radius and the centre of the circle is (a,b)

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Q: How can you tell what a circles equation is?
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When was Aristotle exiled from Athens?

He was killed by a scared messanger when he was trying to find out the equation to the circumference of circles. There was an army invading and a messenger was sent to tell Aristotle. Aristotle said"DON'T DISTURB MY CIRCLES!!!!!" and the scared messenger murdered him.


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What can the discriminant tell you about a quadratic equation?

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