Question 282183
The way I see how to do this is that:

{{{x^2 + y^2 = 25}}} is a circle centered at the origin with radius 5

{{{ graph( 300, 200, -7, 7, -7, 7, y = sqrt(25 - x^2), y = -sqrt(25 - x^2)) }}}

You will want everything shaded in the circle since you are using the less than or equals to inequality.