5 balls place ajacent to each other one above find the height from the center the 6th ball to ground

if the radius of each ball is r
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Each ball is separated by a diameter (2r) from the ball beneath it. The centre of the top ball is a radius above the one below. So if there are 5 stacked balls the top ball is 4 diameters, 8r, from the ground from its base and an additional radius from its centre=9r. A sixth ball's centre would be 11r from the ground.

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