What is the equation of the circle with a center at $(-1 ,-3 )$ and a radius of $2$ ?

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Answer 1 · 2016-01-22T21:11:58

$(x+1)^2+(y+3)^2=4$

Any general circle centred at $(a,b)$ and with radius $r$ has equation $(x-a)^2+(y-b)^2=r^2$ .

So in this case, the equation would be

$(x+1)^2+(y+3)^2=4$

What is the equation of the circle with a center at (-1 ,-3 )(-1 ,-3 ) and a radius of 2 2 ?