Find an equation of the circle with centre at (0,0) and radius r.

Question

TextStandard Equation of Circle

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Find the equation of the circle with centre (–3, 2) and radius 4.

Find the equation of the circle which passes through the points (2, – 2), and (3,4) and whose centre lies on the line x + y = 2.

centre (0,2) and radius 2

centre (–2,3) and radius 4

centre (1/2, 1/4) and radius 1/12

centre (1,1) and radius √2