Question

The hospital provides ambulance service within a 30 mile radius of the hospital. If this service area is represented graphically, with the hospital located at (0, 0), what is the equation that represents the service area?
A. x^2 + y^2 = 900
B. x^2 + y^2 = 30
C. (x - 30)^2 + (y - 30)^2 = 0
D. (x + 30)^2 + (y + 30)^2 = 0

Answer 1

If you have a circle centered at the origin (like this one), then the equation is x^2 + y^2 = r^2. Looking at the picture, what is r (the radius)?

Answer 2

15 @Nory