Question

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

Answer 1

Answer:

Radius = 2.

Step-by-step 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.