16

if both circles have a radii of 4 then they have a diameter of 8,

if the point which the circles have in common is exactly at the opposite side of the circle to the points A and B

then the line AB would consist of both diameters added together....

if both circles have a radii of 4 then they have a diameter of 8,

if the point which the circles have in common is exactly at the opposite side of the circle to the points A and B

then the line AB would consist of both diameters added together....