• 13. A circle with the equation x2 + y2 = 144 is graphed in the standard (x,y) coordinate plane. At what points does the circle intersect the x-axis?
    Choice B
    13. A circle with the equation x2 + y2 = 144 is graphed in the standard (x,y) coordinate plane. At what points does the circle intersect the x-axis?

    The equation of a circle in the standard (x,y) plane is:

    $$(x-h)^{2}+(y-k)^{2}=r^{2}$$

    Where (h,k) is the center of the circle and r is the radius.

    $$r^{2}=144$$ $$=> r=12$$

    The circle intersects with the x-axis at (0,12), (-12,0)