8 sphere of radius 10 cm each are placed...

8 sphere of radius 10 cm each are placed on a table with their centres vertically above the vertices of a regular octagon drawn on the table and each sphere touching its two neighbors. A sphere of radius r is placed in the centre so that it touches the table and each of the 8 spheres, then r is ?

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8 sphere of radius 10 cm each are placed on a table with their centres vertically above the vertices of a regular octagon drawn on the table and each sphere touching its two neighbors. A sphere of radius r is placed in the centre so that it touches the table and each of the 8 spheres, then r is ?

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