A line segment AB is the diameter of a circle with centre at O having radius 6.5 cm. Point P is in the plane of the circle such that AP = x and BP = y. In which one of the following cases the point P does not lie on the circle?
x = 6.5 cm and y = 6.5 cm
x = 12 cm and y = 5 cm
x = 5 cm and y = 12 cm
x = 0 cm and y = 13 cm
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