Question

What is the standard form of the equation of a circle with a center of (0, 8) and a radius of 9?

Answer 1

`x^2+(y-8)^2=81`

Explanation:

Any circle centred at (a,b) and of radius r has equation
`(x-a)^2+(y-b)^2=r^2`.

So the equation of this particular circle will then be

`(x-0)^2+(y-8)^2=9^2`