Question

Find the equation of the circle whose centre is (– 1, 2) and radius 5 units.​

Answer 1

Answer:

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Step-by-step explanation:

We know that the equation of a circle with centre at (h,k)(h,k) and radius rr is (x−h)2+(y−k)2=r2(x−h)2+(y−k)2=r2

Thus, the required equation of the circle with centre at (−1,2)(−1,2) and radius 55 is (x+1)2+(y−2)2=25⇒x2+y2+2x−4y−20=0