In the x-y plane, a given circle with center at the origin contains the point (-3, 4). Which of the following points is NOT on the given circle?
(3,-4)
(0,-5)
(3,4)
(0, rt7)
none

Question

In the x-y plane, a given circle with center at the origin contains the point (-3, 4). Which of the following points is NOT on the given circle?
(3,-4)
(0,-5)
(3,4)
(0, rt7)
none

psymon · Answer

Well, you would need to determine what the radius is. If a point (x,y) is on a circle, then x^2 + y^2 will equal r^2. So I would use your point to determine what the radius is. From there, you can use that radius to determine which of those points would not be on a circle with that radius.

zzr0ck3r · Answer

can you figure out the radius?