Question

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

Answer 1

Answer:

Radius of the given circle is r = 2.

Step-by-step explanation:

Given equation of the circle 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 is $x^2 + y^2 = r^2$, 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.

Answer 2

ANSWER

The radius is 2

EXPLANATION

The given equation of the circle is

${x}^{2} + {y}^{2} = 4$

.This is the same as

${x}^{2} + {y}^{2} = {2}^{2}$

We campare to the equation of the circle with center at the origin.

${x}^{2} + {y}^{2} = {r}^{2}$

We have

$r = 2$

.Hence the radius of the circle is 2