Question

Find the radius of the circle whose equation is x^2 + y^2 = 4.

Answer 1

Radius = 2.

Explanation:

We have been given equation of the circle which is
`x^2 + y^2 = 4`.

Now we need to find the radius of the given circle
`x^2 + y^2 = 4`.

To find that let's compare with the formula of the circle with standard equation of the circle
`x^2 + y^2 = r^2`, where r is the radius.

We get
`r^2 = 4`

take square root of both sides.

`r=2`

Hence radius of the given circle is r = 2.