What is the equation of the circle with a center at $(- 3, - 1)$ $(-3 ,-1 )$ and a radius of $5$ $5$ ?

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Answer 1 · 2016-01-19T12:36:46

${(x + 3)}^{2} + {(y + 1)}^{2} = 25$ $(x+3)^2+(y+1)^2=25$

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

What is the equation of the circle with a center at (−3,−1)(-3 ,-1 ) and a radius of 55 ?