a) Given circle A with radius 5 that has a center of (-2,1), write the equation of the circle AND explain how you would graph the circle. b) Tony has no clue how to write the standard equation of a circle. Explain to Tony how to do this given Circle B has the equation x2 + y2 + 8x - 4y + 4 = 0. c) How would Tony find the center and radius of the equation above?

Q: how is the equation for a circle written?

A: Let us take center of the circle as (h,k) and radius = r.

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