Question

Circle has a radius of 4 and center is (-4,-8) what’s the equation of the circle if I double the radius

Answer 1

Answer:

An equation of the circle with center (h,k) and radius r is

(x−h)

2

+(y−k)

2

=r

2

So, comparing (−4−x)

2

+(−y+11)

2

=9 that is (x−(−4))

2

+(y−11)

2

=9 with the above equation of circle we get:

h=−4, k=11 and r=3

Therefore, center of the circle is (−4,11) and radius of the circle is r