Question

The circle is centered at the origin, and the length of its radius is 3. What is the circles equation?

Answer 1

X^2+Y^2=9 I think

Answer 2

The circle equation is
`x^(2)+y^(2)=9`

Explanation:

The rule of the equation of the circle whose center (h , k) and radius r is:

`(x-h)^(2)+(y-k)^(2)=r^(2)`

∵ The center of the circle is the origin (0 , 0) and its radius is 3

∴ The equation is
`(x-0)^(2)+(y-0)^(2)=3^(2)`

∴
`x^(2)+y^(2)=9`