Question

Which is the equation of a circle with the center at (4, 7) and the radius 4 units long?
(x + 4)2 + (y + 7)2 = 16
(x − 4)2 + (y − 7)2 = 16
(x + 4)2 + (y + 7)2 = 4
(x − 4)2 + (y − 7)2 = 4

Answer 1

(x-4)2+(y-7)2=16

Answer 2

how did you get that?

Answer 3

the general equation of a circle is (x-a)^2+(y-b)^2=r^2
when (a,b) is the center.r is radius