En la escuela se va construir la cancha de futbol rápido que tiene 120m de largo y 60 m de ancho, pero su alrededor se hara una
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Check the picture below.
since the circle is centered at the (0,0) origin, and a point on it is at (0, -9), its radius is simple the distance between those two, or r = 9.
if the second point is also on the circle, it must also be 9 units away from the origin.
