Cube in sphere

The sphere is inscribed cube with edge 8 cm. Find the radius of the sphere.

Correct result:

r =  6.9282 cm

Solution:

a=8 cm  u=3⋅ a=3⋅ 8=8 3 cm≐13.8564 cm  r=u/2=13.8564/2=4 3=6.9282 cm

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