Question

Which is the equation of the circle?

Answer 1

Equation of a circle is given by:
(x-a)²+(y-b)²=r²
where (a,b) is the center of the circle and r is the radius. From the graph;
(a,b)=(-1,2) and r=7
thus plugging the values in the equation we get:
(x--1)²+(y-2)²=7²
simplifying the above we get:
(x+1)²+(y-2)²=49
hence we conclude that the answer is:
B](x+1)²+(y-2)²=49