Using a graphing calculator to grab the support on an approximate square viewing window

For this problem, we are given the expression for a circle and we need to determine which graph represents it.
The expression for the circle is:
[tex]x^2+y^2=49[/tex]We can rewrite it as:
[tex]x^2+y^2=7^2[/tex]This means that the radius is equal to 7. So we need to find the circle that has a center in the origin and a radius equal to 7. The correct option is the bottom right option.