# Tangent spheres

A sphere with a radius of 1 m is placed in the corner of the room. What is the largest sphere size that fits into the corner behind it?

Additional info: Two spheres are placed in a corner of a room. The spheres are each tangent to the walls and floor and tangent to each other.

Correct result:

r =  0.268 m

#### Solution:

$R=1 \ \text{m} \ \\ u=\sqrt{ 3 } \cdot \ R=\sqrt{ 3 } \cdot \ 1 \doteq \sqrt{ 3 } \ \text{m} \doteq 1.7321 \ \text{m} \ \\ x=u-R=1.7321-1 \doteq 0.7321 \ \text{m} \ \\ \ \\ x=r + \sqrt{ 3 } r \ \\ \ \\ r=x/(1+\sqrt{ 3 })=0.7321/(1+\sqrt{ 3 })=0.268 \ \text{m}$

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